13900327921 has 2 divisors, whose sum is σ = 13900327922. Its totient is φ = 13900327920.

The previous prime is 13900327919. The next prime is 13900327979. The reversal of 13900327921 is 12972300931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10355911696 + 3544416225 = 101764^2 + 59535^2 .

It is a cyclic number.

It is not a de Polignac number, because 13900327921 - 2¹ = 13900327919 is a prime.

It is a super-2 number, since 2×13900327921² (a number of 21 digits) contains 22 as substring.

Together with 13900327919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13900327981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6950163960 + 6950163961.

It is an arithmetic number, because the mean of its divisors is an integer number (6950163961).

Almost surely, 2^13900327921 is an apocalyptic number.

It is an amenable number.

13900327921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13900327921 is an equidigital number, since it uses as much as digits as its factorization.

13900327921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 13900327921 in words is "thirteen billion, nine hundred million, three hundred twenty-seven thousand, nine hundred twenty-one".