31331211012 has 36 divisors (see below), whose sum is σ = 79547251056. Its totient is φ = 10397726640.

The previous prime is 31331210969. The next prime is 31331211029. The reversal of 31331211012 is 21011213313.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1908814 + ... + 1925157.

Almost surely, 2^31331211012 is an apocalyptic number.

It is an amenable number.

31331211012 is an abundant number, since it is smaller than the sum of its proper divisors (48216040044).

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

31331211012 is a wasteful number, since it uses less digits than its factorization.

31331211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3834208 (or 3834203 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31331211012 its reverse (21011213313), we get a palindrome (52342424325).

The spelling of 31331211012 in words is "thirty-one billion, three hundred thirty-one million, two hundred eleven thousand, twelve".