13804979363621 has 2 divisors, whose sum is σ = 13804979363622. Its totient is φ = 13804979363620.

The previous prime is 13804979363569. The next prime is 13804979363629. The reversal of 13804979363621 is 12636397940831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7899253134721 + 5905726228900 = 2810561^2 + 2430170^2 .

It is a cyclic number.

It is not a de Polignac number, because 13804979363621 - 2¹⁰ = 13804979362597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13804979363629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6902489681810 + 6902489681811.

It is an arithmetic number, because the mean of its divisors is an integer number (6902489681811).

Almost surely, 2^{13804979363621} is an apocalyptic number.

It is an amenable number.

13804979363621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13804979363621 is an equidigital number, since it uses as much as digits as its factorization.

13804979363621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35271936, while the sum is 62.

The spelling of 13804979363621 in words is "thirteen trillion, eight hundred four billion, nine hundred seventy-nine million, three hundred sixty-three thousand, six hundred twenty-one".