12400966021 has 2 divisors, whose sum is σ = 12400966022. Its totient is φ = 12400966020.

The previous prime is 12400965919. The next prime is 12400966043. The reversal of 12400966021 is 12066900421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6302136996 + 6098829025 = 79386^2 + 78095^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400966021 - 2²³ = 12392577413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400966091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200483010 + 6200483011.

It is an arithmetic number, because the mean of its divisors is an integer number (6200483011).

Almost surely, 2^12400966021 is an apocalyptic number.

It is an amenable number.

12400966021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400966021 is an equidigital number, since it uses as much as digits as its factorization.

12400966021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 12400966021 in words is "twelve billion, four hundred million, nine hundred sixty-six thousand, twenty-one".