| Base | Representation |
|---|---|
| bin | 101010010110111… |
| … | …1010010000000100 |
| 3 | 10200001110121011200 |
| 4 | 1110231322100010 |
| 5 | 10402324234340 |
| 6 | 353011502500 |
| 7 | 50136013434 |
| oct | 12455722004 |
| 9 | 3601417150 |
| 10 | 1421321220 |
| 11 | 66a331740 |
| 12 | 337bb7a30 |
| 13 | 198605397 |
| 14 | d6aa22c4 |
| 15 | 84ba7330 |
| hex | 54b7a404 |
1421321220 has 144 divisors (see below), whose sum is σ = 4950953280. Its totient is φ = 326419200.
The previous prime is 1421321191. The next prime is 1421321243. The reversal of 1421321220 is 221231241.
It is a happy number.
1421321220 is a `hidden beast` number, since 1 + 421 + 3 + 21 + 220 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 1421321193 and 1421321202.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18730 + ... + 56510.
It is an arithmetic number, because the mean of its divisors is an integer number (34381620).
Almost surely, 21421321220 is an apocalyptic number.
1421321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1421321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2475476640).
1421321220 is an abundant number, since it is smaller than the sum of its proper divisors (3529632060).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1421321220 is a wasteful number, since it uses less digits than its factorization.
1421321220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 37826 (or 37821 counting only the distinct ones).
The product of its (nonzero) digits is 192, while the sum is 18.
The square root of 1421321220 is about 37700.4140560817. The cubic root of 1421321220 is about 1124.3393573067.
Adding to 1421321220 its reverse (221231241), we get a palindrome (1642552461).
The spelling of 1421321220 in words is "one billion, four hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty".
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