21592619 has 2 divisors, whose sum is σ = 21592620. Its totient is φ = 21592618.

The previous prime is 21592589. The next prime is 21592621. The reversal of 21592619 is 91629512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21592619 is a prime.

It is a super-2 number, since 2×21592619² = 932482390558322, which contains 22 as substring.

Together with 21592621, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (21592019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10796309 + 10796310.

It is an arithmetic number, because the mean of its divisors is an integer number (10796310).

Almost surely, 2^21592619 is an apocalyptic number.

21592619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21592619 is an equidigital number, since it uses as much as digits as its factorization.

21592619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 21592619 is about 4646.7858784325. The cubic root of 21592619 is about 278.4636045814.

The spelling of 21592619 in words is "twenty-one million, five hundred ninety-two thousand, six hundred nineteen".