31221400431012 has 24 divisors (see below), whose sum is σ = 79472655642912. Its totient is φ = 9461030433600.

The previous prime is 31221400431007. The next prime is 31221400431037. The reversal of 31221400431012 is 21013400412213.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118262880289 + ... + 118262880552.

It is an arithmetic number, because the mean of its divisors is an integer number (3311360651788).

Almost surely, 2^{31221400431012} is an apocalyptic number.

It is an amenable number.

31221400431012 is an abundant number, since it is smaller than the sum of its proper divisors (48251255211900).

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

31221400431012 is a wasteful number, since it uses less digits than its factorization.

31221400431012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236525760859 (or 236525760857 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31221400431012 its reverse (21013400412213), we get a palindrome (52234800843225).

The spelling of 31221400431012 in words is "thirty-one trillion, two hundred twenty-one billion, four hundred million, four hundred thirty-one thousand, twelve".