31201213121022 has 16 divisors (see below), whose sum is σ = 71317058562432. Its totient is φ = 8914632320280.

The previous prime is 31201213120997. The next prime is 31201213121033. The reversal of 31201213121022 is 22012131210213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31201213121022.

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, 371443013304 + ... + 371443013387.

It is an arithmetic number, because the mean of its divisors is an integer number (4457316160152).

Almost surely, 2^{31201213121022} is an apocalyptic number.

31201213121022 is an abundant number, since it is smaller than the sum of its proper divisors (40115845441410).

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

31201213121022 is a wasteful number, since it uses less digits than its factorization.

31201213121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742886026703.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31201213121022 its reverse (22012131210213), we get a palindrome (53213344331235).

The spelling of 31201213121022 in words is "thirty-one trillion, two hundred one billion, two hundred thirteen million, one hundred twenty-one thousand, twenty-two".