10408816126721 has 2 divisors, whose sum is σ = 10408816126722. Its totient is φ = 10408816126720.

The previous prime is 10408816126711. The next prime is 10408816126727. The reversal of 10408816126721 is 12762161880401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9894239451121 + 514576675600 = 3145511^2 + 717340^2 .

It is a cyclic number.

It is not a de Polignac number, because 10408816126721 - 2²⁶ = 10408749017857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10408816126727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5204408063360 + 5204408063361.

It is an arithmetic number, because the mean of its divisors is an integer number (5204408063361).

Almost surely, 2^{10408816126721} is an apocalyptic number.

It is an amenable number.

10408816126721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10408816126721 is an equidigital number, since it uses as much as digits as its factorization.

10408816126721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 10408816126721 in words is "ten trillion, four hundred eight billion, eight hundred sixteen million, one hundred twenty-six thousand, seven hundred twenty-one".