121939731572 has 12 divisors (see below), whose sum is σ = 213435128676. Its totient is φ = 60958266240.

The previous prime is 121939731569. The next prime is 121939731581. The reversal of 121939731572 is 275137939121.

It can be written as a sum of positive squares in 2 ways, for example, as 38213994256 + 83725737316 = 195484^2 + 289354^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 121939731572.

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, 2876213 + ... + 2918300.

It is an arithmetic number, because the mean of its divisors is an integer number (17786260723).

Almost surely, 2^121939731572 is an apocalyptic number.

It is an amenable number.

121939731572 is a deficient number, since it is larger than the sum of its proper divisors (91495397104).

121939731572 is a wasteful number, since it uses less digits than its factorization.

121939731572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5799778 (or 5799776 counting only the distinct ones).

The product of its digits is 714420, while the sum is 50.

The spelling of 121939731572 in words is "one hundred twenty-one billion, nine hundred thirty-nine million, seven hundred thirty-one thousand, five hundred seventy-two".