172121232 has 20 divisors (see below), whose sum is σ = 444646640. Its totient is φ = 57373728.

The previous prime is 172121227. The next prime is 172121233. The reversal of 172121232 is 232121271.

It is a junction number, because it is equal to n+sod(n) for n = 172121199 and 172121208.

It is not an unprimeable number, because it can be changed into a prime (172121233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792882 + ... + 1792977.

It is an arithmetic number, because the mean of its divisors is an integer number (22232332).

Almost surely, 2^172121232 is an apocalyptic number.

172121232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172121232 is an abundant number, since it is smaller than the sum of its proper divisors (272525408).

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

172121232 is a wasteful number, since it uses less digits than its factorization.

172121232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585870 (or 3585864 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 172121232 is about 13119.4981611341. The cubic root of 172121232 is about 556.2604062860.

The spelling of 172121232 in words is "one hundred seventy-two million, one hundred twenty-one thousand, two hundred thirty-two".