31311121011220 has 24 divisors (see below), whose sum is σ = 66156748941024. Its totient is φ = 12447611296416.

The previous prime is 31311121011167. The next prime is 31311121011241. The reversal of 31311121011220 is 2211012111313.

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, 4802315914 + ... + 4802322433.

It is an arithmetic number, because the mean of its divisors is an integer number (2756531205876).

Almost surely, 2^{31311121011220} is an apocalyptic number.

It is an amenable number.

31311121011220 is an abundant number, since it is smaller than the sum of its proper divisors (34845627929804).

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

31311121011220 is a wasteful number, since it uses less digits than its factorization.

31311121011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9604638519 (or 9604638517 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31311121011220 its reverse (2211012111313), we get a palindrome (33522133122533).

The spelling of 31311121011220 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-one million, eleven thousand, two hundred twenty".