31311222131020 has 24 divisors (see below), whose sum is σ = 70811533127664. Its totient is φ = 11561066632896.

The previous prime is 31311222131017. The next prime is 31311222131047. The reversal of 31311222131020 is 2013122211313.

It is a junction number, because it is equal to n+sod(n) for n = 31311222130982 and 31311222131000.

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, 60213888454 + ... + 60213888973.

It is an arithmetic number, because the mean of its divisors is an integer number (2950480546986).

Almost surely, 2^{31311222131020} is an apocalyptic number.

It is an amenable number.

31311222131020 is an abundant number, since it is smaller than the sum of its proper divisors (39500310996644).

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

31311222131020 is a wasteful number, since it uses less digits than its factorization.

31311222131020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120427777449 (or 120427777447 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31311222131020 its reverse (2013122211313), we get a palindrome (33324344342333).

The spelling of 31311222131020 in words is "thirty-one trillion, three hundred eleven billion, two hundred twenty-two million, one hundred thirty-one thousand, twenty".