13979582821 has 2 divisors, whose sum is σ = 13979582822. Its totient is φ = 13979582820.

The previous prime is 13979582819. The next prime is 13979582839. The reversal of 13979582821 is 12828597931.

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., 8579390625 + 5400192196 = 92625^2 + 73486^2 .

It is a cyclic number.

It is not a de Polignac number, because 13979582821 - 2¹ = 13979582819 is a prime.

Together with 13979582819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13979582021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6989791410 + 6989791411.

It is an arithmetic number, because the mean of its divisors is an integer number (6989791411).

Almost surely, 2^13979582821 is an apocalyptic number.

It is an amenable number.

13979582821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13979582821 is an equidigital number, since it uses as much as digits as its factorization.

13979582821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The spelling of 13979582821 in words is "thirteen billion, nine hundred seventy-nine million, five hundred eighty-two thousand, eight hundred twenty-one".