31121001012 has 24 divisors (see below), whose sum is σ = 72675078336. Its totient is φ = 10365179968.

The previous prime is 31121001007. The next prime is 31121001031. The reversal of 31121001012 is 21010012113.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1045593 + ... + 1074944.

It is an arithmetic number, because the mean of its divisors is an integer number (3028128264).

Almost surely, 2^31121001012 is an apocalyptic number.

It is an amenable number.

31121001012 is an abundant number, since it is smaller than the sum of its proper divisors (41554077324).

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

31121001012 is a wasteful number, since it uses less digits than its factorization.

31121001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121767 (or 2121765 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 31121001012 its reverse (21010012113), we get a palindrome (52131013125).

The spelling of 31121001012 in words is "thirty-one billion, one hundred twenty-one million, one thousand, twelve".