31221211012 has 24 divisors (see below), whose sum is σ = 55591099200. Its totient is φ = 15338306016.

The previous prime is 31221211003. The next prime is 31221211013. The reversal of 31221211012 is 21011212213.

It is not an unprimeable number, because it can be changed into a prime (31221211013) 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, 452289 + ... + 516727.

It is an arithmetic number, because the mean of its divisors is an integer number (2316295800).

Almost surely, 2^31221211012 is an apocalyptic number.

It is an amenable number.

31221211012 is a deficient number, since it is larger than the sum of its proper divisors (24369888188).

31221211012 is a wasteful number, since it uses less digits than its factorization.

31221211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66555 (or 66553 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31221211012 its reverse (21011212213), we get a palindrome (52232423225).

The spelling of 31221211012 in words is "thirty-one billion, two hundred twenty-one million, two hundred eleven thousand, twelve".