21621404102664 has 32 divisors (see below), whose sum is σ = 54060906168000. Its totient is φ = 7206148579392.

The previous prime is 21621404102653. The next prime is 21621404102681. The reversal of 21621404102664 is 46620140412612.

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, 61453524 + ... + 61804355.

It is an arithmetic number, because the mean of its divisors is an integer number (1689403317750).

Almost surely, 2^{21621404102664} is an apocalyptic number.

21621404102664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21621404102664 is an abundant number, since it is smaller than the sum of its proper divisors (32439502065336).

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

21621404102664 is a wasteful number, since it uses less digits than its factorization.

21621404102664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123265197 (or 123265193 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 21621404102664 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred four million, one hundred two thousand, six hundred sixty-four".