13738317421 has 2 divisors, whose sum is σ = 13738317422. Its totient is φ = 13738317420.

The previous prime is 13738317409. The next prime is 13738317431. The reversal of 13738317421 is 12471383731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11217775396 + 2520542025 = 105914^2 + 50205^2 .

It is a cyclic number.

It is not a de Polignac number, because 13738317421 - 2¹⁵ = 13738284653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13738317401) 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, 6869158710 + 6869158711.

It is an arithmetic number, because the mean of its divisors is an integer number (6869158711).

Almost surely, 2^13738317421 is an apocalyptic number.

It is an amenable number.

13738317421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13738317421 is an equidigital number, since it uses as much as digits as its factorization.

13738317421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The spelling of 13738317421 in words is "thirteen billion, seven hundred thirty-eight million, three hundred seventeen thousand, four hundred twenty-one".