31203231212 has 12 divisors (see below), whose sum is σ = 55168600200. Its totient is φ = 15440774016.

The previous prime is 31203231211. The next prime is 31203231229. The reversal of 31203231212 is 21213230213.

It is not an unprimeable number, because it can be changed into a prime (31203231211) 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, 40209962 + ... + 40210737.

It is an arithmetic number, because the mean of its divisors is an integer number (4597383350).

Almost surely, 2^31203231212 is an apocalyptic number.

It is an amenable number.

31203231212 is a deficient number, since it is larger than the sum of its proper divisors (23965368988).

31203231212 is a wasteful number, since it uses less digits than its factorization.

31203231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80420800 (or 80420798 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31203231212 its reverse (21213230213), we get a palindrome (52416461425).

Subtracting from 31203231212 its reverse (21213230213), we obtain a palindrome (9990000999).

The spelling of 31203231212 in words is "thirty-one billion, two hundred three million, two hundred thirty-one thousand, two hundred twelve".