21664548453080 has 64 divisors (see below), whose sum is σ = 52623217231200. Its totient is φ = 7979659822080.

The previous prime is 21664548453019. The next prime is 21664548453137. The reversal of 21664548453080 is 8035484546612.

It is a super-2 number, since 2×21664548453080² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 50719586 + ... + 51144945.

Almost surely, 2^{21664548453080} is an apocalyptic number.

21664548453080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21664548453080 is an abundant number, since it is smaller than the sum of its proper divisors (30958668778120).

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

21664548453080 is a wasteful number, since it uses less digits than its factorization.

21664548453080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101864964 (or 101864960 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 56.

The spelling of 21664548453080 in words is "twenty-one trillion, six hundred sixty-four billion, five hundred forty-eight million, four hundred fifty-three thousand, eighty".