21199999695913 has 2 divisors, whose sum is σ = 21199999695914. Its totient is φ = 21199999695912.

The previous prime is 21199999695911. The next prime is 21199999695961. The reversal of 21199999695913 is 31959699999112.

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., 16472623587904 + 4727376108009 = 4058648^2 + 2174253^2 .

It is a cyclic number.

It is not a de Polignac number, because 21199999695913 - 2¹ = 21199999695911 is a prime.

It is a super-2 number, since 2×21199999695913² (a number of 27 digits) contains 22 as substring.

Together with 21199999695911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21199999695911) 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, 10599999847956 + 10599999847957.

It is an arithmetic number, because the mean of its divisors is an integer number (10599999847957).

Almost surely, 2^{21199999695913} is an apocalyptic number.

It is an amenable number.

21199999695913 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199999695913 is an equidigital number, since it uses as much as digits as its factorization.

21199999695913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860934420, while the sum is 82.

The spelling of 21199999695913 in words is "twenty-one trillion, one hundred ninety-nine billion, nine hundred ninety-nine million, six hundred ninety-five thousand, nine hundred thirteen".