21264338960 has 40 divisors (see below), whose sum is σ = 49446150720. Its totient is φ = 8504606592.

The previous prime is 21264338947. The next prime is 21264338969. The reversal of 21264338960 is 6983346212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21264338960² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21264338969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860051 + ... + 884429.

It is an arithmetic number, because the mean of its divisors is an integer number (1236153768).

Almost surely, 2^21264338960 is an apocalyptic number.

21264338960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21264338960 is an abundant number, since it is smaller than the sum of its proper divisors (28181811760).

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

21264338960 is a wasteful number, since it uses less digits than its factorization.

21264338960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35295 (or 35289 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 21264338960 in words is "twenty-one billion, two hundred sixty-four million, three hundred thirty-eight thousand, nine hundred sixty".