13423401523621 has 2 divisors, whose sum is σ = 13423401523622. Its totient is φ = 13423401523620.

The previous prime is 13423401523613. The next prime is 13423401523667. The reversal of 13423401523621 is 12632510432431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13238427556225 + 184973967396 = 3638465^2 + 430086^2 .

It is a cyclic number.

It is not a de Polignac number, because 13423401523621 - 2³ = 13423401523613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13423401523121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6711700761810 + 6711700761811.

It is an arithmetic number, because the mean of its divisors is an integer number (6711700761811).

Almost surely, 2^{13423401523621} is an apocalyptic number.

It is an amenable number.

13423401523621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13423401523621 is an equidigital number, since it uses as much as digits as its factorization.

13423401523621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 13423401523621 in words is "thirteen trillion, four hundred twenty-three billion, four hundred one million, five hundred twenty-three thousand, six hundred twenty-one".