121572156 has 48 divisors (see below), whose sum is σ = 289939104. Its totient is φ = 39638016.

The previous prime is 121572149. The next prime is 121572161. The reversal of 121572156 is 651275121.

It is a super-2 number, since 2×121572156² = 29559578228976672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119506 + ... + 120518.

It is an arithmetic number, because the mean of its divisors is an integer number (6040398).

Almost surely, 2^121572156 is an apocalyptic number.

It is an amenable number.

121572156 is an abundant number, since it is smaller than the sum of its proper divisors (168366948).

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

121572156 is a wasteful number, since it uses less digits than its factorization.

121572156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1228 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 121572156 is about 11025.9764193472. The cubic root of 121572156 is about 495.3871147884.

The spelling of 121572156 in words is "one hundred twenty-one million, five hundred seventy-two thousand, one hundred fifty-six".