21657401484 has 48 divisors (see below), whose sum is σ = 53834551680. Its totient is φ = 6756773760.

The previous prime is 21657401483. The next prime is 21657401497. The reversal of 21657401484 is 48410475612.

It is not an unprimeable number, because it can be changed into a prime (21657401483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553297 + ... + 591144.

It is an arithmetic number, because the mean of its divisors is an integer number (1121553160).

Almost surely, 2^21657401484 is an apocalyptic number.

It is an amenable number.

21657401484 is an abundant number, since it is smaller than the sum of its proper divisors (32177150196).

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

21657401484 is a wasteful number, since it uses less digits than its factorization.

21657401484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144550 (or 1144548 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 21657401484 in words is "twenty-one billion, six hundred fifty-seven million, four hundred one thousand, four hundred eighty-four".