31212111200020 has 24 divisors (see below), whose sum is σ = 65645809402824. Its totient is φ = 12465725264256.

The previous prime is 31212111199999. The next prime is 31212111200047. The reversal of 31212111200020 is 2000211121213.

It can be written as a sum of positive squares in 4 ways, for example, as 1607347267344 + 29604763932676 = 1267812^2 + 5441026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31212111199967 and 31212111200003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194937599 + ... + 1194963718.

It is an arithmetic number, because the mean of its divisors is an integer number (2735242058451).

Almost surely, 2^{31212111200020} is an apocalyptic number.

It is an amenable number.

31212111200020 is an abundant number, since it is smaller than the sum of its proper divisors (34433698202804).

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

31212111200020 is a wasteful number, since it uses less digits than its factorization.

31212111200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389901979 (or 2389901977 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31212111200020 its reverse (2000211121213), we get a palindrome (33212322321233).

The spelling of 31212111200020 in words is "thirty-one trillion, two hundred twelve billion, one hundred eleven million, two hundred thousand, twenty".