31231132212 has 48 divisors (see below), whose sum is σ = 85314321792. Its totient is φ = 8705541120.

The previous prime is 31231132211. The next prime is 31231132279. The reversal of 31231132212 is 21223113213.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 (31231132211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4530693 + ... + 4537580.

It is an arithmetic number, because the mean of its divisors is an integer number (1777381704).

Almost surely, 2^31231132212 is an apocalyptic number.

It is an amenable number.

31231132212 is an abundant number, since it is smaller than the sum of its proper divisors (54083189580).

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

31231132212 is a wasteful number, since it uses less digits than its factorization.

31231132212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9068328 (or 9068326 counting only the distinct ones).

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

Adding to 31231132212 its reverse (21223113213), we get a palindrome (52454245425).

The spelling of 31231132212 in words is "thirty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, two hundred twelve".