21922319 has 2 divisors, whose sum is σ = 21922320. Its totient is φ = 21922318.

The previous prime is 21922279. The next prime is 21922321. The reversal of 21922319 is 91322912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21922319 - 2⁸ = 21922063 is a prime.

It is a super-2 number, since 2×21922319² = 961176140675522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 21922321, 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 = 21922291 and 21922300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961159 + 10961160.

It is an arithmetic number, because the mean of its divisors is an integer number (10961160).

Almost surely, 2^21922319 is an apocalyptic number.

21922319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922319 is an equidigital number, since it uses as much as digits as its factorization.

21922319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 21922319 is about 4682.1276146641. The cubic root of 21922319 is about 279.8737483540.

The spelling of 21922319 in words is "twenty-one million, nine hundred twenty-two thousand, three hundred nineteen".