312031312220 has 12 divisors (see below), whose sum is σ = 655265755704. Its totient is φ = 124812524880.

The previous prime is 312031312213. The next prime is 312031312223. The reversal of 312031312220 is 22213130213.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 15601565611 = 312031312220 / (3 + 1 + 2 + 0 + 3 + 1 + 3 + 1 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 312031312192 and 312031312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312031312223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7800782786 + ... + 7800782825.

It is an arithmetic number, because the mean of its divisors is an integer number (54605479642).

Almost surely, 2^312031312220 is an apocalyptic number.

It is an amenable number.

312031312220 is an abundant number, since it is smaller than the sum of its proper divisors (343234443484).

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

312031312220 is a wasteful number, since it uses less digits than its factorization.

312031312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15601565620 (or 15601565618 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 312031312220 its reverse (22213130213), we get a palindrome (334244442433).

The spelling of 312031312220 in words is "three hundred twelve billion, thirty-one million, three hundred twelve thousand, two hundred twenty".