13215905172 has 72 divisors (see below), whose sum is σ = 35074821600. Its totient is φ = 4189889088.

The previous prime is 13215905147. The next prime is 13215905189. The reversal of 13215905172 is 27150951231.

13215905172 is a `hidden beast` number, since 13 + 2 + 1 + 590 + 51 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24522 + ... + 164417.

It is an arithmetic number, because the mean of its divisors is an integer number (487150300).

Almost surely, 2^13215905172 is an apocalyptic number.

13215905172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13215905172 is an abundant number, since it is smaller than the sum of its proper divisors (21858916428).

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

13215905172 is a wasteful number, since it uses less digits than its factorization.

13215905172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189045 (or 189040 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The spelling of 13215905172 in words is "thirteen billion, two hundred fifteen million, nine hundred five thousand, one hundred seventy-two".