21822319 has 4 divisors (see below), whose sum is σ = 21981744. Its totient is φ = 21662896.

The previous prime is 21822293. The next prime is 21822343. The reversal of 21822319 is 91322812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21822319 - 2⁵ = 21822287 is a prime.

It is a super-2 number, since 2×21822319² = 952427213075522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79507 + ... + 79780.

It is an arithmetic number, because the mean of its divisors is an integer number (5495436).

Almost surely, 2^21822319 is an apocalyptic number.

21822319 is a deficient number, since it is larger than the sum of its proper divisors (159425).

21822319 is a wasteful number, since it uses less digits than its factorization.

21822319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159424.

The product of its digits is 1728, while the sum is 28.

The square root of 21822319 is about 4671.4365028329. The cubic root of 21822319 is about 279.4475459012.

The spelling of 21822319 in words is "twenty-one million, eight hundred twenty-two thousand, three hundred nineteen".