21329719 has 2 divisors, whose sum is σ = 21329720. Its totient is φ = 21329718.

The previous prime is 21329699. The next prime is 21329773. The reversal of 21329719 is 91792312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21329719 - 2⁹ = 21329207 is a prime.

It is a super-2 number, since 2×21329719² = 909913825237922, which contains 22 as substring.

It is equal to p_1349494 and since 21329719 and 1349494 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21359719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10664859 + 10664860.

It is an arithmetic number, because the mean of its divisors is an integer number (10664860).

Almost surely, 2^21329719 is an apocalyptic number.

21329719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21329719 is an equidigital number, since it uses as much as digits as its factorization.

21329719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 21329719 is about 4618.4108738829. The cubic root of 21329719 is about 277.3288461133.

The spelling of 21329719 in words is "twenty-one million, three hundred twenty-nine thousand, seven hundred nineteen".