121158172 has 24 divisors (see below), whose sum is σ = 220822560. Its totient is φ = 58094400.

The previous prime is 121158131. The next prime is 121158197. The reversal of 121158172 is 271851121.

It is a self number, because there is not a number n which added to its sum of digits gives 121158172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14058 + ... + 20974.

It is an arithmetic number, because the mean of its divisors is an integer number (9200940).

Almost surely, 2^121158172 is an apocalyptic number.

It is an amenable number.

121158172 is a deficient number, since it is larger than the sum of its proper divisors (99664388).

121158172 is a wasteful number, since it uses less digits than its factorization.

121158172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7101 (or 7099 counting only the distinct ones).

The product of its digits is 1120, while the sum is 28.

The square root of 121158172 is about 11007.1872883130. The cubic root of 121158172 is about 494.8241690908.

The spelling of 121158172 in words is "one hundred twenty-one million, one hundred fifty-eight thousand, one hundred seventy-two".