10398111686621 has 2 divisors, whose sum is σ = 10398111686622. Its totient is φ = 10398111686620.

The previous prime is 10398111686587. The next prime is 10398111686671. The reversal of 10398111686621 is 12668611189301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6152805835225 + 4245305851396 = 2480485^2 + 2060414^2 .

It is an emirp because it is prime and its reverse (12668611189301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10398111686621 - 2³⁴ = 10380931817437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10398111686671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199055843310 + 5199055843311.

It is an arithmetic number, because the mean of its divisors is an integer number (5199055843311).

Almost surely, 2^{10398111686621} is an apocalyptic number.

It is an amenable number.

10398111686621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10398111686621 is an equidigital number, since it uses as much as digits as its factorization.

10398111686621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 10398111686621 in words is "ten trillion, three hundred ninety-eight billion, one hundred eleven million, six hundred eighty-six thousand, six hundred twenty-one".