121012172 has 12 divisors (see below), whose sum is σ = 211872696. Its totient is φ = 60477120.

The previous prime is 121012141. The next prime is 121012183. The reversal of 121012172 is 271210121.

It is a self number, because there is not a number n which added to its sum of digits gives 121012172.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4148 + ... + 16100.

It is an arithmetic number, because the mean of its divisors is an integer number (17656058).

Almost surely, 2^121012172 is an apocalyptic number.

It is an amenable number.

121012172 is a deficient number, since it is larger than the sum of its proper divisors (90860524).

121012172 is a wasteful number, since it uses less digits than its factorization.

121012172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14488 (or 14486 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 121012172 is about 11000.5532588138. The cubic root of 121012172 is about 494.6253288311.

Adding to 121012172 its reverse (271210121), we get a palindrome (392222293).

The spelling of 121012172 in words is "one hundred twenty-one million, twelve thousand, one hundred seventy-two".