12313021993 has 2 divisors, whose sum is σ = 12313021994. Its totient is φ = 12313021992.

The previous prime is 12313021979. The next prime is 12313021997. The reversal of 12313021993 is 39912031321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7692693264 + 4620328729 = 87708^2 + 67973^2 .

It is a cyclic number.

It is not a de Polignac number, because 12313021993 - 2⁹ = 12313021481 is a prime.

It is a super-2 number, since 2×12313021993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12313021997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156510996 + 6156510997.

It is an arithmetic number, because the mean of its divisors is an integer number (6156510997).

Almost surely, 2^12313021993 is an apocalyptic number.

It is an amenable number.

12313021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12313021993 is an equidigital number, since it uses as much as digits as its factorization.

12313021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The spelling of 12313021993 in words is "twelve billion, three hundred thirteen million, twenty-one thousand, nine hundred ninety-three".