121251551156 has 12 divisors (see below), whose sum is σ = 221415876192. Its totient is φ = 57989872248.

The previous prime is 121251551143. The next prime is 121251551171. The reversal of 121251551156 is 651155152121.

It is a congruent number.

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, 658975730 + ... + 658975913.

It is an arithmetic number, because the mean of its divisors is an integer number (18451323016).

Almost surely, 2^121251551156 is an apocalyptic number.

It is an amenable number.

121251551156 is a deficient number, since it is larger than the sum of its proper divisors (100164325036).

121251551156 is a wasteful number, since it uses less digits than its factorization.

121251551156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317951670 (or 1317951668 counting only the distinct ones).

The product of its digits is 15000, while the sum is 35.

The spelling of 121251551156 in words is "one hundred twenty-one billion, two hundred fifty-one million, five hundred fifty-one thousand, one hundred fifty-six".