21794719 has 2 divisors, whose sum is σ = 21794720. Its totient is φ = 21794718.

The previous prime is 21794693. The next prime is 21794737. The reversal of 21794719 is 91749712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21794719 - 2⁹ = 21794207 is a prime.

It is a super-2 number, since 2×21794719² = 950019552577922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21794779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897359 + 10897360.

It is an arithmetic number, because the mean of its divisors is an integer number (10897360).

Almost surely, 2^21794719 is an apocalyptic number.

21794719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21794719 is an equidigital number, since it uses as much as digits as its factorization.

21794719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 21794719 is about 4668.4814447527. The cubic root of 21794719 is about 279.3296848229.

The spelling of 21794719 in words is "twenty-one million, seven hundred ninety-four thousand, seven hundred nineteen".