21356157054015 has 48 divisors (see below), whose sum is σ = 43670224705536. Its totient is φ = 9447885144000.

The previous prime is 21356157053929. The next prime is 21356157054031. The reversal of 21356157054015 is 51045075165312.

21356157054015 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 61 + 570 + 5 + 4 + 0 + 15 = 666.

It is not a de Polignac number, because 21356157054015 - 2¹³ = 21356157045823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1093495461 + ... + 1093514990.

It is an arithmetic number, because the mean of its divisors is an integer number (909796348032).

Almost surely, 2^{21356157054015} is an apocalyptic number.

21356157054015 is an abundant number, since it is smaller than the sum of its proper divisors (22314067651521).

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

21356157054015 is a wasteful number, since it uses less digits than its factorization.

21356157054015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187010500 (or 2187010497 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 21356157054015 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred fifty-seven million, fifty-four thousand, fifteen".