31212213132 has 12 divisors (see below), whose sum is σ = 72828497336. Its totient is φ = 10404071040.

The previous prime is 31212213077. The next prime is 31212213133. The reversal of 31212213132 is 23131221213.

It is a tau number, because it is divible by the number of its divisors (12).

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

It is a junction number, because it is equal to n+sod(n) for n = 31212213099 and 31212213108.

It is not an unprimeable number, because it can be changed into a prime (31212213133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300508869 + ... + 1300508892.

Almost surely, 2^31212213132 is an apocalyptic number.

It is an amenable number.

31212213132 is an abundant number, since it is smaller than the sum of its proper divisors (41616284204).

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

31212213132 is a wasteful number, since it uses less digits than its factorization.

31212213132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601017768 (or 2601017766 counting only the distinct ones).

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

Adding to 31212213132 its reverse (23131221213), we get a palindrome (54343434345).

The spelling of 31212213132 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, one hundred thirty-two".