31211313220020 has 48 divisors (see below), whose sum is σ = 87392030100480. Its totient is φ = 8322983231616.

The previous prime is 31211313219937. The next prime is 31211313220033. The reversal of 31211313220020 is 2002231311213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16287789 + ... + 18102891.

It is an arithmetic number, because the mean of its divisors is an integer number (1820667293760).

Almost surely, 2^{31211313220020} is an apocalyptic number.

31211313220020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31211313220020 is an abundant number, since it is smaller than the sum of its proper divisors (56180716880460).

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

31211313220020 is a wasteful number, since it uses less digits than its factorization.

31211313220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101704 (or 2101702 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31211313220020 its reverse (2002231311213), we get a palindrome (33213544531233).

The spelling of 31211313220020 in words is "thirty-one trillion, two hundred eleven billion, three hundred thirteen million, two hundred twenty thousand, twenty".