21315515202 has 16 divisors (see below), whose sum is σ = 47367811680. Its totient is φ = 7105171716.

The previous prime is 21315515191. The next prime is 21315515209. The reversal of 21315515202 is 20251551312.

21315515202 is a `hidden beast` number, since 2 + 131 + 5 + 5 + 1 + 520 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21315515209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197365828 + ... + 197365935.

It is an arithmetic number, because the mean of its divisors is an integer number (2960488230).

Almost surely, 2^21315515202 is an apocalyptic number.

21315515202 is an abundant number, since it is smaller than the sum of its proper divisors (26052296478).

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

21315515202 is a wasteful number, since it uses less digits than its factorization.

21315515202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394731774 (or 394731768 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 21315515202 in words is "twenty-one billion, three hundred fifteen million, five hundred fifteen thousand, two hundred two".