31312220000 has 60 divisors (see below), whose sum is σ = 77032807236. Its totient is φ = 12524880000.

The previous prime is 31312219979. The next prime is 31312220011. The reversal of 31312220000 is 2221313.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 762806 + ... + 802805.

Almost surely, 2^31312220000 is an apocalyptic number.

It is an amenable number.

31312220000 is an abundant number, since it is smaller than the sum of its proper divisors (45720587236).

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

31312220000 is an equidigital number, since it uses as much as digits as its factorization.

31312220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565641 (or 1565618 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31312220000 its reverse (2221313), we get a palindrome (31314441313).

The spelling of 31312220000 in words is "thirty-one billion, three hundred twelve million, two hundred twenty thousand".