10243418978621 has 2 divisors, whose sum is σ = 10243418978622. Its totient is φ = 10243418978620.

The previous prime is 10243418978593. The next prime is 10243418978651. The reversal of 10243418978621 is 12687981434201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7373152776025 + 2870266202596 = 2715355^2 + 1694186^2 .

It is a cyclic number.

It is not a de Polignac number, because 10243418978621 - 2¹⁸ = 10243418716477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10243418978651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5121709489310 + 5121709489311.

It is an arithmetic number, because the mean of its divisors is an integer number (5121709489311).

Almost surely, 2^{10243418978621} is an apocalyptic number.

It is an amenable number.

10243418978621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10243418978621 is an equidigital number, since it uses as much as digits as its factorization.

10243418978621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 10243418978621 in words is "ten trillion, two hundred forty-three billion, four hundred eighteen million, nine hundred seventy-eight thousand, six hundred twenty-one".