121557707512 has 16 divisors (see below), whose sum is σ = 227980221840. Its totient is φ = 60762981696.

The previous prime is 121557707497. The next prime is 121557707549. The reversal of 121557707512 is 215707755121.

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, 1951428 + ... + 2012755.

It is an arithmetic number, because the mean of its divisors is an integer number (14248763865).

Almost surely, 2^121557707512 is an apocalyptic number.

It is an amenable number.

121557707512 is a deficient number, since it is larger than the sum of its proper divisors (106422514328).

121557707512 is a wasteful number, since it uses less digits than its factorization.

121557707512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968022 (or 3968018 counting only the distinct ones).

The product of its (nonzero) digits is 171500, while the sum is 43.

The spelling of 121557707512 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven hundred seven thousand, five hundred twelve".