31021313212 has 6 divisors (see below), whose sum is σ = 54287298128. Its totient is φ = 15510656604.

The previous prime is 31021313201. The next prime is 31021313231. The reversal of 31021313212 is 21231312013.

It is a self number, because there is not a number n which added to its sum of digits gives 31021313212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3877664148 + ... + 3877664155.

Almost surely, 2^31021313212 is an apocalyptic number.

It is an amenable number.

31021313212 is a deficient number, since it is larger than the sum of its proper divisors (23265984916).

31021313212 is a wasteful number, since it uses less digits than its factorization.

31021313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7755328307 (or 7755328305 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31021313212 its reverse (21231312013), we get a palindrome (52252625225).

The spelling of 31021313212 in words is "thirty-one billion, twenty-one million, three hundred thirteen thousand, two hundred twelve".