21814319 has 2 divisors, whose sum is σ = 21814320. Its totient is φ = 21814318.

The previous prime is 21814313. The next prime is 21814321. The reversal of 21814319 is 91341812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21814319 - 2²⁰ = 20765743 is a prime.

It is a super-2 number, since 2×21814319² = 951729026867522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 21814321, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21814291 and 21814300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21814313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907159 + 10907160.

It is an arithmetic number, because the mean of its divisors is an integer number (10907160).

Almost surely, 2^21814319 is an apocalyptic number.

21814319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814319 is an equidigital number, since it uses as much as digits as its factorization.

21814319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 21814319 is about 4670.5801566829. The cubic root of 21814319 is about 279.4133935026.

The spelling of 21814319 in words is "twenty-one million, eight hundred fourteen thousand, three hundred nineteen".