Base | Representation |
---|---|
bin | 101000000100… |
… | …1101100110010 |
3 | 1110112111000110 |
4 | 1100021230302 |
5 | 20334330000 |
6 | 2030202150 |
7 | 343410201 |
oct | 120115462 |
9 | 43474013 |
10 | 21011250 |
11 | 10951077 |
12 | 7053356 |
13 | 44787c0 |
14 | 2b0d238 |
15 | 1ca0850 |
hex | 1409b32 |
21011250 has 80 divisors (see below), whose sum is σ = 56681856. Its totient is φ = 5160000.
The previous prime is 21011239. The next prime is 21011251. The reversal of 21011250 is 5211012.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (21011251) by changing a digit.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48535 + ... + 48965.
Almost surely, 221011250 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21011250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28340928).
21011250 is an abundant number, since it is smaller than the sum of its proper divisors (35670606).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21011250 is a wasteful number, since it uses less digits than its factorization.
21011250 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 469 (or 454 counting only the distinct ones).
The product of its (nonzero) digits is 20, while the sum is 12.
The square root of 21011250 is about 4583.8030062384. The cubic root of 21011250 is about 275.9416753463.
Adding to 21011250 its reverse (5211012), we get a palindrome (26222262).
The spelling of 21011250 in words is "twenty-one million, eleven thousand, two hundred fifty".
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