21113264 has 20 divisors (see below), whose sum is σ = 42686256. Its totient is φ = 10097472.

The previous prime is 21113251. The next prime is 21113297. The reversal of 21113264 is 46231112.

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, 28319 + ... + 29054.

Almost surely, 2^21113264 is an apocalyptic number.

It is an amenable number.

21113264 is an abundant number, since it is smaller than the sum of its proper divisors (21572992).

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

21113264 is a wasteful number, since it uses less digits than its factorization.

21113264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57404 (or 57398 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 21113264 is about 4594.9171918545. The cubic root of 21113264 is about 276.3875393264.

Adding to 21113264 its reverse (46231112), we get a palindrome (67344376).

The spelling of 21113264 in words is "twenty-one million, one hundred thirteen thousand, two hundred sixty-four".