21326256 has 60 divisors (see below), whose sum is σ = 68213392. Its totient is φ = 6092928.

The previous prime is 21326231. The next prime is 21326309. The reversal of 21326256 is 65262312.

21326256 is a `hidden beast` number, since 2 + 1 + 32 + 625 + 6 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9571 + ... + 11586.

Almost surely, 2^21326256 is an apocalyptic number.

It is an amenable number.

21326256 is an abundant number, since it is smaller than the sum of its proper divisors (46887136).

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

21326256 is a wasteful number, since it uses less digits than its factorization.

21326256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21178 (or 21169 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21326256 is about 4618.0359461572. The cubic root of 21326256 is about 277.3138366677.

Adding to 21326256 its reverse (65262312), we get a palindrome (86588568).

The spelling of 21326256 in words is "twenty-one million, three hundred twenty-six thousand, two hundred fifty-six".