31221203012 has 12 divisors (see below), whose sum is σ = 54638592876. Its totient is φ = 15610176480.

The previous prime is 31221202993. The next prime is 31221203029. The reversal of 31221203012 is 21030212213.

It can be written as a sum of positive squares in 2 ways, for example, as 16470128896 + 14751074116 = 128336^2 + 121454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106238 + ... + 271530.

It is an arithmetic number, because the mean of its divisors is an integer number (4553216073).

Almost surely, 2^31221203012 is an apocalyptic number.

It is an amenable number.

31221203012 is a deficient number, since it is larger than the sum of its proper divisors (23417389864).

31221203012 is a wasteful number, since it uses less digits than its factorization.

31221203012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212518 (or 212516 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31221203012 its reverse (21030212213), we get a palindrome (52251415225).

The spelling of 31221203012 in words is "thirty-one billion, two hundred twenty-one million, two hundred three thousand, twelve".