172921320852 has 36 divisors (see below), whose sum is σ = 469357872480. Its totient is φ = 49406091504.

The previous prime is 172921320827. The next prime is 172921320863. The reversal of 172921320852 is 258023129271.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147041352 + ... + 147042527.

It is an arithmetic number, because the mean of its divisors is an integer number (13037718680).

Almost surely, 2^172921320852 is an apocalyptic number.

172921320852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172921320852 is an abundant number, since it is smaller than the sum of its proper divisors (296436551628).

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

172921320852 is a wasteful number, since it uses less digits than its factorization.

172921320852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294083900 (or 294083891 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 172921320852 in words is "one hundred seventy-two billion, nine hundred twenty-one million, three hundred twenty thousand, eight hundred fifty-two".