121573686872 has 16 divisors (see below), whose sum is σ = 248673450600. Its totient is φ = 55260766720.

The previous prime is 121573686869. The next prime is 121573686901. The reversal of 121573686872 is 278686375121.

It is a super-2 number, since 2×121573686872² (a number of 23 digits) contains 22 as substring.

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, 690759497 + ... + 690759672.

Almost surely, 2^121573686872 is an apocalyptic number.

It is an amenable number.

121573686872 is an abundant number, since it is smaller than the sum of its proper divisors (127099763728).

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

121573686872 is a wasteful number, since it uses less digits than its factorization.

121573686872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381519186 (or 1381519182 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 56.

The spelling of 121573686872 in words is "one hundred twenty-one billion, five hundred seventy-three million, six hundred eighty-six thousand, eight hundred seventy-two".