31122213121020 has 96 divisors (see below), whose sum is σ = 99592052894208. Its totient is φ = 7113579363072.

The previous prime is 31122213121007. The next prime is 31122213121099. The reversal of 31122213121020 is 2012131222113.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51691234 + ... + 52289846.

It is an arithmetic number, because the mean of its divisors is an integer number (1037417217648).

Almost surely, 2^{31122213121020} is an apocalyptic number.

31122213121020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31122213121020 is an abundant number, since it is smaller than the sum of its proper divisors (68469839773188).

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

31122213121020 is a wasteful number, since it uses less digits than its factorization.

31122213121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722419 (or 722417 counting only the distinct ones).

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

Adding to 31122213121020 its reverse (2012131222113), we get a palindrome (33134344343133).

The spelling of 31122213121020 in words is "thirty-one trillion, one hundred twenty-two billion, two hundred thirteen million, one hundred twenty-one thousand, twenty".