21917929420288 has 80 divisors (see below), whose sum is σ = 49851377807616. Its totient is φ = 9529534474240.

The previous prime is 21917929420193. The next prime is 21917929420291. The reversal of 21917929420288 is 88202492971912.

21917929420288 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

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, 84472156 + ... + 84731227.

Almost surely, 2^{21917929420288} is an apocalyptic number.

It is an amenable number.

21917929420288 is an abundant number, since it is smaller than the sum of its proper divisors (27933448387328).

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

21917929420288 is a wasteful number, since it uses less digits than its factorization.

21917929420288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169203435 (or 169203419 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 64.

The spelling of 21917929420288 in words is "twenty-one trillion, nine hundred seventeen billion, nine hundred twenty-nine million, four hundred twenty thousand, two hundred eighty-eight".