121204172 has 24 divisors (see below), whose sum is σ = 222673920. Its totient is φ = 57649680.

The previous prime is 121204147. The next prime is 121204177. The reversal of 121204172 is 271402121.

It is not an unprimeable number, because it can be changed into a prime (121204177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968 + ... + 15599.

It is an arithmetic number, because the mean of its divisors is an integer number (9278080).

Almost surely, 2^121204172 is an apocalyptic number.

It is an amenable number.

121204172 is a deficient number, since it is larger than the sum of its proper divisors (101469748).

121204172 is a wasteful number, since it uses less digits than its factorization.

121204172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16661 (or 16659 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 121204172 is about 11009.2766338211. The cubic root of 121204172 is about 494.8867842969.

Adding to 121204172 its reverse (271402121), we get a palindrome (392606293).

The spelling of 121204172 in words is "one hundred twenty-one million, two hundred four thousand, one hundred seventy-two".