31223312012 has 6 divisors (see below), whose sum is σ = 54640796028. Its totient is φ = 15611656004.

The previous prime is 31223311997. The next prime is 31223312027. The reversal of 31223312012 is 21021332213.

It is an interprime number because it is at equal distance from previous prime (31223311997) and next prime (31223312027).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3902913998 + ... + 3902914005.

It is an arithmetic number, because the mean of its divisors is an integer number (9106799338).

Almost surely, 2^31223312012 is an apocalyptic number.

It is an amenable number.

31223312012 is a deficient number, since it is larger than the sum of its proper divisors (23417484016).

31223312012 is a wasteful number, since it uses less digits than its factorization.

31223312012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7805828007 (or 7805828005 counting only the distinct ones).

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

Adding to 31223312012 its reverse (21021332213), we get a palindrome (52244644225).

The spelling of 31223312012 in words is "thirty-one billion, two hundred twenty-three million, three hundred twelve thousand, twelve".