31220403012 has 72 divisors (see below), whose sum is σ = 82936229376. Its totient is φ = 9890040384.

The previous prime is 31220402999. The next prime is 31220403017. The reversal of 31220403012 is 21030402213.

31220403012 is a `hidden beast` number, since 31 + 220 + 403 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31220403017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215268 + ... + 329819.

Almost surely, 2^31220403012 is an apocalyptic number.

It is an amenable number.

31220403012 is an abundant number, since it is smaller than the sum of its proper divisors (51715826364).

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

31220403012 is a wasteful number, since it uses less digits than its factorization.

31220403012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545177 (or 545172 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31220403012 its reverse (21030402213), we get a palindrome (52250805225).

The spelling of 31220403012 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, twelve".