13918592921 has 2 divisors, whose sum is σ = 13918592922. Its totient is φ = 13918592920.

The previous prime is 13918592911. The next prime is 13918592923. The reversal of 13918592921 is 12929581931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13726465600 + 192127321 = 117160^2 + 13861^2 .

It is a cyclic number.

It is not a de Polignac number, because 13918592921 - 2¹⁴ = 13918576537 is a prime.

It is a super-2 number, since 2×13918592921² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 13918592923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13918592921.

It is not a weakly prime, because it can be changed into another prime (13918592923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6959296460 + 6959296461.

It is an arithmetic number, because the mean of its divisors is an integer number (6959296461).

Almost surely, 2^13918592921 is an apocalyptic number.

It is an amenable number.

13918592921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13918592921 is an equidigital number, since it uses as much as digits as its factorization.

13918592921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The spelling of 13918592921 in words is "thirteen billion, nine hundred eighteen million, five hundred ninety-two thousand, nine hundred twenty-one".