13340449921 has 2 divisors, whose sum is σ = 13340449922. Its totient is φ = 13340449920.

The previous prime is 13340449919. The next prime is 13340450009. The reversal of 13340449921 is 12994404331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13339095025 + 1354896 = 115495^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 13340449921 - 2¹ = 13340449919 is a prime.

Together with 13340449919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13340449621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6670224960 + 6670224961.

It is an arithmetic number, because the mean of its divisors is an integer number (6670224961).

Almost surely, 2^13340449921 is an apocalyptic number.

It is an amenable number.

13340449921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13340449921 is an equidigital number, since it uses as much as digits as its factorization.

13340449921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 13340449921 in words is "thirteen billion, three hundred forty million, four hundred forty-nine thousand, nine hundred twenty-one".