31212213232 has 40 divisors (see below), whose sum is σ = 61999059584. Its totient is φ = 15213852864.

The previous prime is 31212213167. The next prime is 31212213233. The reversal of 31212213232 is 23231221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212213233) 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, 316453 + ... + 403195.

Almost surely, 2^31212213232 is an apocalyptic number.

It is an amenable number.

31212213232 is a deficient number, since it is larger than the sum of its proper divisors (30786846352).

31212213232 is a wasteful number, since it uses less digits than its factorization.

31212213232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87317 (or 87311 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 31212213232 its reverse (23231221213), we get a palindrome (54443434445).

The spelling of 31212213232 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, two hundred thirty-two".