31223132212 has 48 divisors (see below), whose sum is σ = 61039440000. Its totient is φ = 13887949824.

The previous prime is 31223132207. The next prime is 31223132267. The reversal of 31223132212 is 21223132213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539664 + ... + 594712.

It is an arithmetic number, because the mean of its divisors is an integer number (1271655000).

Almost surely, 2^31223132212 is an apocalyptic number.

It is an amenable number.

31223132212 is a deficient number, since it is larger than the sum of its proper divisors (29816307788).

31223132212 is a wasteful number, since it uses less digits than its factorization.

31223132212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55528 (or 55526 counting only the distinct ones).

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

Adding to 31223132212 its reverse (21223132213), we get a palindrome (52446264425).

Subtracting from 31223132212 its reverse (21223132213), we obtain a palindrome (9999999999).

It can be divided in two parts, 312231 and 32212, that added together give a palindrome (344443).

The spelling of 31223132212 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, two hundred twelve".