13393672421 has 2 divisors, whose sum is σ = 13393672422. Its totient is φ = 13393672420.

The previous prime is 13393672399. The next prime is 13393672427. The reversal of 13393672421 is 12427639331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12368776225 + 1024896196 = 111215^2 + 32014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13393672421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13393672427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6696836210 + 6696836211.

It is an arithmetic number, because the mean of its divisors is an integer number (6696836211).

Almost surely, 2^13393672421 is an apocalyptic number.

It is an amenable number.

13393672421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13393672421 is an equidigital number, since it uses as much as digits as its factorization.

13393672421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 41.

The spelling of 13393672421 in words is "thirteen billion, three hundred ninety-three million, six hundred seventy-two thousand, four hundred twenty-one".