31221225012 has 24 divisors (see below), whose sum is σ = 72860661216. Its totient is φ = 10405484128.

The previous prime is 31221224977. The next prime is 31221225017. The reversal of 31221225012 is 21052212213.

It is a self number, because there is not a number n which added to its sum of digits gives 31221225012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221225017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115698 + ... + 275369.

It is an arithmetic number, because the mean of its divisors is an integer number (3035860884).

Almost surely, 2^31221225012 is an apocalyptic number.

It is an amenable number.

31221225012 is an abundant number, since it is smaller than the sum of its proper divisors (41639436204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221225012 is a wasteful number, since it uses less digits than its factorization.

31221225012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397727 (or 397725 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 31221225012 its reverse (21052212213), we get a palindrome (52273437225).

The spelling of 31221225012 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-five thousand, twelve".