31023211212 has 36 divisors (see below), whose sum is σ = 89622610896. Its totient is φ = 8863774560.

The previous prime is 31023211169. The next prime is 31023211259. The reversal of 31023211212 is 21211232013.

31023211212 is a `hidden beast` number, since 310 + 232 + 1 + 121 + 2 = 666.

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, 61553739 + ... + 61554242.

Almost surely, 2^31023211212 is an apocalyptic number.

It is an amenable number.

31023211212 is an abundant number, since it is smaller than the sum of its proper divisors (58599399684).

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

31023211212 is a wasteful number, since it uses less digits than its factorization.

31023211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123107998 (or 123107993 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31023211212 its reverse (21211232013), we get a palindrome (52234443225).

The spelling of 31023211212 in words is "thirty-one billion, twenty-three million, two hundred eleven thousand, two hundred twelve".