31331100321020 has 24 divisors (see below), whose sum is σ = 65795427700800. Its totient is φ = 12532417837632.

The previous prime is 31331100321011. The next prime is 31331100321061. The reversal of 31331100321020 is 2012300113313.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31331100320983 and 31331100321001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14623661 + ... + 16628699.

It is an arithmetic number, because the mean of its divisors is an integer number (2741476154200).

Almost surely, 2^{31331100321020} is an apocalyptic number.

It is an amenable number.

31331100321020 is an abundant number, since it is smaller than the sum of its proper divisors (34464327379780).

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

31331100321020 is a wasteful number, since it uses less digits than its factorization.

31331100321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786357 (or 2786355 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31331100321020 its reverse (2012300113313), we get a palindrome (33343400434333).

The spelling of 31331100321020 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred million, three hundred twenty-one thousand, twenty".