312221223131 has 2 divisors, whose sum is σ = 312221223132. Its totient is φ = 312221223130.

The previous prime is 312221223121. The next prime is 312221223143. The reversal of 312221223131 is 131322122213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312221223131 is a prime.

It is a super-2 number, since 2×312221223131² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312221223097 and 312221223106.

It is not a weakly prime, because it can be changed into another prime (312221223121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156110611565 + 156110611566.

It is an arithmetic number, because the mean of its divisors is an integer number (156110611566).

Almost surely, 2^312221223131 is an apocalyptic number.

312221223131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312221223131 is an equidigital number, since it uses as much as digits as its factorization.

312221223131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 312221223131 its reverse (131322122213), we get a palindrome (443543345344).

The spelling of 312221223131 in words is "three hundred twelve billion, two hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-one".