121531971736 has 16 divisors (see below), whose sum is σ = 260425653840. Its totient is φ = 52085130720.

The previous prime is 121531971713. The next prime is 121531971787. The reversal of 121531971736 is 637179135121.

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, 1085106835 + ... + 1085106946.

It is an arithmetic number, because the mean of its divisors is an integer number (16276603365).

Almost surely, 2^121531971736 is an apocalyptic number.

It is an amenable number.

121531971736 is an abundant number, since it is smaller than the sum of its proper divisors (138893682104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121531971736 is a wasteful number, since it uses less digits than its factorization.

121531971736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170213794 (or 2170213790 counting only the distinct ones).

The product of its digits is 238140, while the sum is 46.

The spelling of 121531971736 in words is "one hundred twenty-one billion, five hundred thirty-one million, nine hundred seventy-one thousand, seven hundred thirty-six".