31212000212 has 24 divisors (see below), whose sum is σ = 54784696680. Its totient is φ = 15559270400.

The previous prime is 31212000191. The next prime is 31212000229. The reversal of 31212000212 is 21200021213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11080930756 + 20131069456 = 105266^2 + 141884^2 .

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, 4470068 + ... + 4477044.

It is an arithmetic number, because the mean of its divisors is an integer number (2282695695).

Almost surely, 2^31212000212 is an apocalyptic number.

It is an amenable number.

31212000212 is a deficient number, since it is larger than the sum of its proper divisors (23572696468).

31212000212 is a wasteful number, since it uses less digits than its factorization.

31212000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171 (or 10169 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31212000212 its reverse (21200021213), we get a palindrome (52412021425).

The spelling of 31212000212 in words is "thirty-one billion, two hundred twelve million, two hundred twelve", and thus it is an aban number.