31213233213212 has 24 divisors (see below), whose sum is σ = 55461635982480. Its totient is φ = 15367246519680.

The previous prime is 31213233213209. The next prime is 31213233213251. The reversal of 31213233213212 is 21231233231213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23735489 + ... + 25015992.

It is an arithmetic number, because the mean of its divisors is an integer number (2310901499270).

Almost surely, 2^{31213233213212} is an apocalyptic number.

It is an amenable number.

31213233213212 is a deficient number, since it is larger than the sum of its proper divisors (24248402769268).

31213233213212 is a wasteful number, since it uses less digits than its factorization.

31213233213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48753941 (or 48753939 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

Adding to 31213233213212 its reverse (21231233231213), we get a palindrome (52444466444425).

The spelling of 31213233213212 in words is "thirty-one trillion, two hundred thirteen billion, two hundred thirty-three million, two hundred thirteen thousand, two hundred twelve".