Base | Representation |
---|---|
bin | 101001110101… |
… | …0001110100000 |
3 | 1112021012120000 |
4 | 1103222032200 |
5 | 21103242122 |
6 | 2102020000 |
7 | 354260343 |
oct | 123521640 |
9 | 45235500 |
10 | 21930912 |
11 | 1141a023 |
12 | 7417600 |
13 | 470b293 |
14 | 2cac45a |
15 | 1dd30ac |
hex | 14ea3a0 |
21930912 has 60 divisors (see below), whose sum is σ = 64505826. Its totient is φ = 7309440.
The previous prime is 21930893. The next prime is 21930913. The reversal of 21930912 is 21903912.
It can be written as a sum of positive squares in only one way, i.e., 15397776 + 6533136 = 3924^2 + 2556^2 .
It is a Harshad number since it is a multiple of its sum of digits (27).
It is not an unprimeable number, because it can be changed into a prime (21930913) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1639 + ... + 6822.
Almost surely, 221930912 is an apocalyptic number.
It is an amenable number.
21930912 is an abundant number, since it is smaller than the sum of its proper divisors (42574914).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21930912 is an equidigital number, since it uses as much as digits as its factorization.
21930912 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8483 (or 8466 counting only the distinct ones).
The product of its (nonzero) digits is 972, while the sum is 27.
The square root of 21930912 is about 4683.0451631390. The cubic root of 21930912 is about 279.9103114104.
Subtracting from 21930912 its reverse (21903912), we obtain a cube (27000 = 303).
The spelling of 21930912 in words is "twenty-one million, nine hundred thirty thousand, nine hundred twelve".
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