21090654864960 has 112 divisors (see below), whose sum is σ = 67099211203392. Its totient is φ = 5612719974400.

The previous prime is 21090654864953. The next prime is 21090654864977. The reversal of 21090654864960 is 6946845609012.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 21090654864894 and 21090654864903.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21900771 + ... + 22843490.

Almost surely, 2^{21090654864960} is an apocalyptic number.

21090654864960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21090654864960 is an abundant number, since it is smaller than the sum of its proper divisors (46008556338432).

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

21090654864960 is a wasteful number, since it uses less digits than its factorization.

21090654864960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44744772 (or 44744762 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 60.

The spelling of 21090654864960 in words is "twenty-one trillion, ninety billion, six hundred fifty-four million, eight hundred sixty-four thousand, nine hundred sixty".