13511416921 has 2 divisors, whose sum is σ = 13511416922. Its totient is φ = 13511416920.

The previous prime is 13511416909. The next prime is 13511416993. The reversal of 13511416921 is 12961411531.

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., 11265699600 + 2245717321 = 106140^2 + 47389^2 .

It is a cyclic number.

It is not a de Polignac number, because 13511416921 - 2⁵ = 13511416889 is a prime.

It is not a weakly prime, because it can be changed into another prime (13511416901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6755708460 + 6755708461.

It is an arithmetic number, because the mean of its divisors is an integer number (6755708461).

Almost surely, 2^13511416921 is an apocalyptic number.

It is an amenable number.

13511416921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13511416921 is an equidigital number, since it uses as much as digits as its factorization.

13511416921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The spelling of 13511416921 in words is "thirteen billion, five hundred eleven million, four hundred sixteen thousand, nine hundred twenty-one".