21262912 has 28 divisors (see below), whose sum is σ = 46030896. Its totient is φ = 9664640.

The previous prime is 21262909. The next prime is 21262939. The reversal of 21262912 is 21926212.

It is a super-2 number, since 2×21262912² = 904222853439488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14398 + ... + 15805.

Almost surely, 2^21262912 is an apocalyptic number.

21262912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21262912 is an abundant number, since it is smaller than the sum of its proper divisors (24767984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21262912 is a wasteful number, since it uses less digits than its factorization.

21262912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30226 (or 30216 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 21262912 is about 4611.1725190021. The cubic root of 21262912 is about 277.0390019239.

The spelling of 21262912 in words is "twenty-one million, two hundred sixty-two thousand, nine hundred twelve".