13639114921 has 2 divisors, whose sum is σ = 13639114922. Its totient is φ = 13639114920.

The previous prime is 13639114889. The next prime is 13639114939. The reversal of 13639114921 is 12941193631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12800433321 + 838681600 = 113139^2 + 28960^2 .

It is an emirp because it is prime and its reverse (12941193631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13639114921 - 2⁵ = 13639114889 is a prime.

It is not a weakly prime, because it can be changed into another prime (13639174921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819557460 + 6819557461.

It is an arithmetic number, because the mean of its divisors is an integer number (6819557461).

Almost surely, 2^13639114921 is an apocalyptic number.

It is an amenable number.

13639114921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639114921 is an equidigital number, since it uses as much as digits as its factorization.

13639114921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The spelling of 13639114921 in words is "thirteen billion, six hundred thirty-nine million, one hundred fourteen thousand, nine hundred twenty-one".