21360859278 has 32 divisors (see below), whose sum is σ = 49347014400. Its totient is φ = 6092223360.

The previous prime is 21360859259. The next prime is 21360859291. The reversal of 21360859278 is 87295806312.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 21360859278.

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, 9517978 + ... + 9520221.

It is an arithmetic number, because the mean of its divisors is an integer number (1542094200).

Almost surely, 2^21360859278 is an apocalyptic number.

21360859278 is an abundant number, since it is smaller than the sum of its proper divisors (27986155122).

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

21360859278 is a wasteful number, since it uses less digits than its factorization.

21360859278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19038232.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 21360859278 in words is "twenty-one billion, three hundred sixty million, eight hundred fifty-nine thousand, two hundred seventy-eight".