21313026864 has 60 divisors (see below), whose sum is σ = 62786191000. Its totient is φ = 6730428672.

The previous prime is 21313026817. The next prime is 21313026887. The reversal of 21313026864 is 46862031312.

21313026864 is a `hidden beast` number, since 21 + 313 + 0 + 268 + 64 = 666.

It is a super-2 number, since 2×21313026864² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3892189 + ... + 3897660.

Almost surely, 2^21313026864 is an apocalyptic number.

21313026864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21313026864 is an abundant number, since it is smaller than the sum of its proper divisors (41473164136).

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

21313026864 is a wasteful number, since it uses less digits than its factorization.

21313026864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789882 (or 7789873 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21313026864 in words is "twenty-one billion, three hundred thirteen million, twenty-six thousand, eight hundred sixty-four".