12776006921 has 2 divisors, whose sum is σ = 12776006922. Its totient is φ = 12776006920.

The previous prime is 12776006891. The next prime is 12776006933. The reversal of 12776006921 is 12960067721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8329117696 + 4446889225 = 91264^2 + 66685^2 .

It is a cyclic number.

It is not a de Polignac number, because 12776006921 - 2¹⁸ = 12775744777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12776006951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6388003460 + 6388003461.

It is an arithmetic number, because the mean of its divisors is an integer number (6388003461).

Almost surely, 2^12776006921 is an apocalyptic number.

It is an amenable number.

12776006921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12776006921 is an equidigital number, since it uses as much as digits as its factorization.

12776006921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 12776006921 in words is "twelve billion, seven hundred seventy-six million, six thousand, nine hundred twenty-one".