31220920012 has 24 divisors (see below), whose sum is σ = 56420582400. Its totient is φ = 15101137680.

The previous prime is 31220919953. The next prime is 31220920033. The reversal of 31220920012 is 21002902213.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288033 + ... + 381319.

It is an arithmetic number, because the mean of its divisors is an integer number (2350857600).

Almost surely, 2^31220920012 is an apocalyptic number.

It is an amenable number.

31220920012 is a deficient number, since it is larger than the sum of its proper divisors (25199662388).

31220920012 is a wasteful number, since it uses less digits than its factorization.

31220920012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96021 (or 96019 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 31220920012 in words is "thirty-one billion, two hundred twenty million, nine hundred twenty thousand, twelve".