31021990512 has 40 divisors (see below), whose sum is σ = 82306096656. Its totient is φ = 10061185536.

The previous prime is 31021990511. The next prime is 31021990561. The reversal of 31021990512 is 21509912013.

It is a super-3 number, since 3×31021990512³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021990511) 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, 8731893 + ... + 8735444.

Almost surely, 2^31021990512 is an apocalyptic number.

It is an amenable number.

31021990512 is an abundant number, since it is smaller than the sum of its proper divisors (51284106144).

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

31021990512 is a wasteful number, since it uses less digits than its factorization.

31021990512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17467385 (or 17467379 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The spelling of 31021990512 in words is "thirty-one billion, twenty-one million, nine hundred ninety thousand, five hundred twelve".