21115056 has 40 divisors (see below), whose sum is σ = 54733104. Its totient is φ = 7014400.

The previous prime is 21115027. The next prime is 21115063. The reversal of 21115056 is 65051112.

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, 18700 + ... + 19796.

Almost surely, 2^21115056 is an apocalyptic number.

It is an amenable number.

21115056 is an abundant number, since it is smaller than the sum of its proper divisors (33618048).

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

21115056 is a wasteful number, since it uses less digits than its factorization.

21115056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 21115056 is about 4595.1121857905. The cubic root of 21115056 is about 276.3953586205.

Adding to 21115056 its reverse (65051112), we get a palindrome (86166168).

The spelling of 21115056 in words is "twenty-one million, one hundred fifteen thousand, fifty-six".