31221530012 has 24 divisors (see below), whose sum is σ = 56599210080. Its totient is φ = 15058883840.

The previous prime is 31221529987. The next prime is 31221530017. The reversal of 31221530012 is 21003512213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221530017) 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, 1054928 + ... + 1084119.

It is an arithmetic number, because the mean of its divisors is an integer number (2358300420).

Almost surely, 2^31221530012 is an apocalyptic number.

It is an amenable number.

31221530012 is a deficient number, since it is larger than the sum of its proper divisors (25377680068).

31221530012 is a wasteful number, since it uses less digits than its factorization.

31221530012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139181 (or 2139179 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The spelling of 31221530012 in words is "thirty-one billion, two hundred twenty-one million, five hundred thirty thousand, twelve".