31231312212 has 24 divisors (see below), whose sum is σ = 72882692512. Its totient is φ = 10409061600.

The previous prime is 31231312207. The next prime is 31231312219. The reversal of 31231312212 is 21221313213.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231312219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75214 + ... + 260997.

Almost surely, 2^31231312212 is an apocalyptic number.

It is an amenable number.

31231312212 is an abundant number, since it is smaller than the sum of its proper divisors (41651380300).

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

31231312212 is a wasteful number, since it uses less digits than its factorization.

31231312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343959 (or 343957 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 31231312212 its reverse (21221313213), we get a palindrome (52452625425).

The spelling of 31231312212 in words is "thirty-one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred twelve".