12431513821 has 2 divisors, whose sum is σ = 12431513822. Its totient is φ = 12431513820.

The previous prime is 12431513813. The next prime is 12431513833. The reversal of 12431513821 is 12831513421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8435504025 + 3996009796 = 91845^2 + 63214^2 .

It is a cyclic number.

It is not a de Polignac number, because 12431513821 - 2³ = 12431513813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12431513851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6215756910 + 6215756911.

It is an arithmetic number, because the mean of its divisors is an integer number (6215756911).

Almost surely, 2^12431513821 is an apocalyptic number.

It is an amenable number.

12431513821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431513821 is an equidigital number, since it uses as much as digits as its factorization.

12431513821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The spelling of 12431513821 in words is "twelve billion, four hundred thirty-one million, five hundred thirteen thousand, eight hundred twenty-one".