31021233212 has 12 divisors (see below), whose sum is σ = 54305789160. Its totient is φ = 15505293456.

The previous prime is 31021233209. The next prime is 31021233263. The reversal of 31021233212 is 21233212013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317662 + ... + 1340997.

It is an arithmetic number, because the mean of its divisors is an integer number (4525482430).

Almost surely, 2^31021233212 is an apocalyptic number.

It is an amenable number.

31021233212 is a deficient number, since it is larger than the sum of its proper divisors (23284555948).

31021233212 is a wasteful number, since it uses less digits than its factorization.

31021233212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661580 (or 2661578 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31021233212 its reverse (21233212013), we get a palindrome (52254445225).

The spelling of 31021233212 in words is "thirty-one billion, twenty-one million, two hundred thirty-three thousand, two hundred twelve".