21442319 has 2 divisors, whose sum is σ = 21442320. Its totient is φ = 21442318.

The previous prime is 21442313. The next prime is 21442327. The reversal of 21442319 is 91324412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21442319 - 2⁸ = 21442063 is a prime.

It is a super-2 number, since 2×21442319² = 919546088195522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721159 + 10721160.

It is an arithmetic number, because the mean of its divisors is an integer number (10721160).

Almost surely, 2^21442319 is an apocalyptic number.

21442319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442319 is an equidigital number, since it uses as much as digits as its factorization.

21442319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 21442319 is about 4630.5851682050. The cubic root of 21442319 is about 277.8159980061.

The spelling of 21442319 in words is "twenty-one million, four hundred forty-two thousand, three hundred nineteen".