21412319 has 2 divisors, whose sum is σ = 21412320. Its totient is φ = 21412318.

The previous prime is 21412309. The next prime is 21412337. The reversal of 21412319 is 91321412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21412319 - 2²⁰ = 20363743 is a prime.

It is a super-2 number, since 2×21412319² = 916974809915522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21412294 and 21412303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21412309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706159 + 10706160.

It is an arithmetic number, because the mean of its divisors is an integer number (10706160).

Almost surely, 2^21412319 is an apocalyptic number.

21412319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412319 is an equidigital number, since it uses as much as digits as its factorization.

21412319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 21412319 is about 4627.3447029587. The cubic root of 21412319 is about 277.6863731912.

The spelling of 21412319 in words is "twenty-one million, four hundred twelve thousand, three hundred nineteen".