21226056 has 32 divisors (see below), whose sum is σ = 55373760. Its totient is φ = 6767552.

The previous prime is 21226039. The next prime is 21226063. The reversal of 21226056 is 65062212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18675 + ... + 19778.

It is an arithmetic number, because the mean of its divisors is an integer number (1730430).

Almost surely, 2^21226056 is an apocalyptic number.

It is an amenable number.

21226056 is an abundant number, since it is smaller than the sum of its proper divisors (34147704).

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

21226056 is a wasteful number, since it uses less digits than its factorization.

21226056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38485 (or 38481 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21226056 is about 4607.1744052076. The cubic root of 21226056 is about 276.8788411298.

Adding to 21226056 its reverse (65062212), we get a palindrome (86288268).

The spelling of 21226056 in words is "twenty-one million, two hundred twenty-six thousand, fifty-six".