12399221831 has 2 divisors, whose sum is σ = 12399221832. Its totient is φ = 12399221830.

The previous prime is 12399221803. The next prime is 12399221843. The reversal of 12399221831 is 13812299321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12399221831 - 2⁶ = 12399221767 is a prime.

It is a super-2 number, since 2×12399221831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12399221801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199610915 + 6199610916.

It is an arithmetic number, because the mean of its divisors is an integer number (6199610916).

Almost surely, 2^12399221831 is an apocalyptic number.

12399221831 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399221831 is an equidigital number, since it uses as much as digits as its factorization.

12399221831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The spelling of 12399221831 in words is "twelve billion, three hundred ninety-nine million, two hundred twenty-one thousand, eight hundred thirty-one".