21089656519 has 2 divisors, whose sum is σ = 21089656520. Its totient is φ = 21089656518.

The previous prime is 21089656513. The next prime is 21089656583. The reversal of 21089656519 is 91565698012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21089656519 - 2⁵ = 21089656487 is a prime.

It is a super-2 number, since 2×21089656519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21089656513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10544828259 + 10544828260.

It is an arithmetic number, because the mean of its divisors is an integer number (10544828260).

Almost surely, 2^21089656519 is an apocalyptic number.

21089656519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21089656519 is an equidigital number, since it uses as much as digits as its factorization.

21089656519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 21089656519 in words is "twenty-one billion, eighty-nine million, six hundred fifty-six thousand, five hundred nineteen".