121557702172 has 12 divisors (see below), whose sum is σ = 212728652136. Its totient is φ = 60778087280.

The previous prime is 121557702113. The next prime is 121557702251. The reversal of 121557702172 is 271207755121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317643 + ... + 586525.

It is an arithmetic number, because the mean of its divisors is an integer number (17727387678).

Almost surely, 2^121557702172 is an apocalyptic number.

It is an amenable number.

121557702172 is a deficient number, since it is larger than the sum of its proper divisors (91170949964).

121557702172 is a wasteful number, since it uses less digits than its factorization.

121557702172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381908 (or 381906 counting only the distinct ones).

The product of its (nonzero) digits is 68600, while the sum is 40.

The spelling of 121557702172 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven hundred two thousand, one hundred seventy-two".