312220331021 has 16 divisors (see below), whose sum is σ = 317733292800. Its totient is φ = 306739560960.

The previous prime is 312220330993. The next prime is 312220331039. The reversal of 312220331021 is 120133022213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312220331021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312220330984 and 312220331002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312220331081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49976120 + ... + 49982366.

It is an arithmetic number, because the mean of its divisors is an integer number (19858330800).

Almost surely, 2^312220331021 is an apocalyptic number.

It is an amenable number.

312220331021 is a deficient number, since it is larger than the sum of its proper divisors (5512961779).

312220331021 is a wasteful number, since it uses less digits than its factorization.

312220331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684.

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

Adding to 312220331021 its reverse (120133022213), we get a palindrome (432353353234).

The spelling of 312220331021 in words is "three hundred twelve billion, two hundred twenty million, three hundred thirty-one thousand, twenty-one".