31821112642 has 24 divisors (see below), whose sum is σ = 52475287788. Its totient is φ = 14461413120.

The previous prime is 31821112639. The next prime is 31821112681. The reversal of 31821112642 is 24621112813.

It can be written as a sum of positive squares in 2 ways, for example, as 29261865721 + 2559246921 = 171061^2 + 50589^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1848298 + ... + 1865434.

Almost surely, 2^31821112642 is an apocalyptic number.

31821112642 is a deficient number, since it is larger than the sum of its proper divisors (20654175146).

31821112642 is a wasteful number, since it uses less digits than its factorization.

31821112642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24834 (or 24823 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The spelling of 31821112642 in words is "thirty-one billion, eight hundred twenty-one million, one hundred twelve thousand, six hundred forty-two".