21596065919 has 2 divisors, whose sum is σ = 21596065920. Its totient is φ = 21596065918.

The previous prime is 21596065903. The next prime is 21596065943. The reversal of 21596065919 is 91956069512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21596065919 - 2⁴ = 21596065903 is a prime.

It is a super-2 number, since 2×21596065919² (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 (21596065319) 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, 10798032959 + 10798032960.

It is an arithmetic number, because the mean of its divisors is an integer number (10798032960).

Almost surely, 2^21596065919 is an apocalyptic number.

21596065919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21596065919 is an equidigital number, since it uses as much as digits as its factorization.

21596065919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1312200, while the sum is 53.

The spelling of 21596065919 in words is "twenty-one billion, five hundred ninety-six million, sixty-five thousand, nine hundred nineteen".