31612385221 has 8 divisors (see below), whose sum is σ = 32780158200. Its totient is φ = 30449791680.

The previous prime is 31612385197. The next prime is 31612385239. The reversal of 31612385221 is 12258321613.

It can be written as a sum of positive squares in 4 ways, for example, as 3101121 + 31609284100 = 1761^2 + 177790^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31612385221 - 2²⁷ = 31478167493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31612385281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1282426 + ... + 1306843.

It is an arithmetic number, because the mean of its divisors is an integer number (4097519775).

Almost surely, 2^31612385221 is an apocalyptic number.

It is an amenable number.

31612385221 is a deficient number, since it is larger than the sum of its proper divisors (1167772979).

31612385221 is a wasteful number, since it uses less digits than its factorization.

31612385221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589719.

The product of its digits is 17280, while the sum is 34.

The spelling of 31612385221 in words is "thirty-one billion, six hundred twelve million, three hundred eighty-five thousand, two hundred twenty-one".