21336503664 has 40 divisors (see below), whose sum is σ = 62993488000. Its totient is φ = 6096143808.

The previous prime is 21336503659. The next prime is 21336503677. The reversal of 21336503664 is 46630563312.

It is a congruent number.

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, 31750414 + ... + 31751085.

It is an arithmetic number, because the mean of its divisors is an integer number (1574837200).

Almost surely, 2^21336503664 is an apocalyptic number.

21336503664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21336503664 is an abundant number, since it is smaller than the sum of its proper divisors (41656984336).

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

21336503664 is a wasteful number, since it uses less digits than its factorization.

21336503664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63501517 (or 63501511 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 21336503664 in words is "twenty-one billion, three hundred thirty-six million, five hundred three thousand, six hundred sixty-four".