12631873921 has 2 divisors, whose sum is σ = 12631873922. Its totient is φ = 12631873920.

The previous prime is 12631873913. The next prime is 12631873993. The reversal of 12631873921 is 12937813621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6907438321 + 5724435600 = 83111^2 + 75660^2 .

It is a cyclic number.

It is not a de Polignac number, because 12631873921 - 2³ = 12631873913 is a prime.

It is not a weakly prime, because it can be changed into another prime (12631873901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315936960 + 6315936961.

It is an arithmetic number, because the mean of its divisors is an integer number (6315936961).

Almost surely, 2^12631873921 is an apocalyptic number.

It is an amenable number.

12631873921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631873921 is an equidigital number, since it uses as much as digits as its factorization.

12631873921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The spelling of 12631873921 in words is "twelve billion, six hundred thirty-one million, eight hundred seventy-three thousand, nine hundred twenty-one".