312220231321 has 4 divisors (see below), whose sum is σ = 312232211200. Its totient is φ = 312208251444.

The previous prime is 312220231291. The next prime is 312220231331. The reversal of 312220231321 is 123132022213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312220231321 - 2⁵ = 312220231289 is a prime.

It is a super-2 number, since 2×312220231321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312220231292 and 312220231301.

It is not an unprimeable number, because it can be changed into a prime (312220231331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5950761 + ... + 6002998.

It is an arithmetic number, because the mean of its divisors is an integer number (78058052800).

Almost surely, 2^312220231321 is an apocalyptic number.

It is an amenable number.

312220231321 is a deficient number, since it is larger than the sum of its proper divisors (11979879).

312220231321 is a wasteful number, since it uses less digits than its factorization.

312220231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11979878.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 312220231321 its reverse (123132022213), we get a palindrome (435352253534).

The spelling of 312220231321 in words is "three hundred twelve billion, two hundred twenty million, two hundred thirty-one thousand, three hundred twenty-one".