312021013231 has 2 divisors, whose sum is σ = 312021013232. Its totient is φ = 312021013230.

The previous prime is 312021013223. The next prime is 312021013259. The reversal of 312021013231 is 132310120213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312021013231 - 2³ = 312021013223 is a prime.

It is a super-2 number, since 2×312021013231² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312021013199 and 312021013208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312021013201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010506615 + 156010506616.

It is an arithmetic number, because the mean of its divisors is an integer number (156010506616).

Almost surely, 2^312021013231 is an apocalyptic number.

312021013231 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021013231 is an equidigital number, since it uses as much as digits as its factorization.

312021013231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 312021013231 its reverse (132310120213), we get a palindrome (444331133444).

The spelling of 312021013231 in words is "three hundred twelve billion, twenty-one million, thirteen thousand, two hundred thirty-one".