21908234331264 has 64 divisors (see below), whose sum is σ = 58259652927840. Its totient is φ = 7294474285056.

The previous prime is 21908234331259. The next prime is 21908234331349. The reversal of 21908234331264 is 46213343280912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31967097 + ... + 32645240.

Almost surely, 2^{21908234331264} is an apocalyptic number.

21908234331264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21908234331264 is an abundant number, since it is smaller than the sum of its proper divisors (36351418596576).

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

21908234331264 is an equidigital number, since it uses as much as digits as its factorization.

21908234331264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64613237 (or 64613225 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 21908234331264 in words is "twenty-one trillion, nine hundred eight billion, two hundred thirty-four million, three hundred thirty-one thousand, two hundred sixty-four".