21264752460 has 72 divisors (see below), whose sum is σ = 69262346160. Its totient is φ = 4860514176.

The previous prime is 21264752437. The next prime is 21264752473. The reversal of 21264752460 is 6425746212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3613515 + ... + 3619394.

It is an arithmetic number, because the mean of its divisors is an integer number (961977030).

Almost surely, 2^21264752460 is an apocalyptic number.

21264752460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21264752460 is an abundant number, since it is smaller than the sum of its proper divisors (47997593700).

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

21264752460 is a wasteful number, since it uses less digits than its factorization.

21264752460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232935 (or 7232926 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 21264752460 in words is "twenty-one billion, two hundred sixty-four million, seven hundred fifty-two thousand, four hundred sixty".