21492596899349 has 2 divisors, whose sum is σ = 21492596899350. Its totient is φ = 21492596899348.

The previous prime is 21492596899259. The next prime is 21492596899351. The reversal of 21492596899349 is 94399869529412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21249168141124 + 243428758225 = 4609682^2 + 493385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21492596899349 is a prime.

Together with 21492596899351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21492596899849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746298449674 + 10746298449675.

It is an arithmetic number, because the mean of its divisors is an integer number (10746298449675).

Almost surely, 2^{21492596899349} is an apocalyptic number.

It is an amenable number.

21492596899349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492596899349 is an equidigital number, since it uses as much as digits as its factorization.

21492596899349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2720977920, while the sum is 80.

The spelling of 21492596899349 in words is "twenty-one trillion, four hundred ninety-two billion, five hundred ninety-six million, eight hundred ninety-nine thousand, three hundred forty-nine".