Base | Representation |
---|---|
bin | 111100001110111… |
… | …1110010101011101 |
3 | 12012212002201010000 |
4 | 1320131332111131 |
5 | 13114401422141 |
6 | 532315404513 |
7 | 101041160052 |
oct | 17035762535 |
9 | 5185081100 |
10 | 2021123421 |
11 | 947964a39 |
12 | 484a53739 |
13 | 262961c25 |
14 | 1525d7029 |
15 | bc6865b6 |
hex | 7877e55d |
2021123421 has 20 divisors (see below), whose sum is σ = 3196811772. Its totient is φ = 1268155008.
The previous prime is 2021123393. The next prime is 2021123437. The reversal of 2021123421 is 1243211202.
It is a happy number.
It can be written as a sum of positive squares in 2 ways, for example, as 1588899321 + 432224100 = 39861^2 + 20790^2 .
It is not a de Polignac number, because 2021123421 - 211 = 2021121373 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 2021123394 and 2021123403.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2021123441) by changing a digit.
It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 732510 + ... + 735263.
Almost surely, 22021123421 is an apocalyptic number.
It is an amenable number.
2021123421 is a deficient number, since it is larger than the sum of its proper divisors (1175688351).
2021123421 is a wasteful number, since it uses less digits than its factorization.
2021123421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1467802 (or 1467793 counting only the distinct ones).
The product of its (nonzero) digits is 192, while the sum is 18.
The square root of 2021123421 is about 44956.9062658898. The cubic root of 2021123421 is about 1264.3411653604.
Adding to 2021123421 its reverse (1243211202), we get a palindrome (3264334623).
The spelling of 2021123421 in words is "two billion, twenty-one million, one hundred twenty-three thousand, four hundred twenty-one".
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