21262056 has 16 divisors (see below), whose sum is σ = 53155200. Its totient is φ = 7087344.

The previous prime is 21262049. The next prime is 21262057. The reversal of 21262056 is 65026212.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 885919 = 21262056 / (2 + 1 + 2 + 6 + 2 + 0 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (21262057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442936 + ... + 442983.

It is an arithmetic number, because the mean of its divisors is an integer number (3322200).

Almost surely, 2^21262056 is an apocalyptic number.

It is an amenable number.

21262056 is an abundant number, since it is smaller than the sum of its proper divisors (31893144).

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

21262056 is a wasteful number, since it uses less digits than its factorization.

21262056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885928 (or 885924 counting only the distinct ones).

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

The square root of 21262056 is about 4611.0797000269. The cubic root of 21262056 is about 277.0352842054.

Adding to 21262056 its reverse (65026212), we get a palindrome (86288268).

The spelling of 21262056 in words is "twenty-one million, two hundred sixty-two thousand, fifty-six".