21022319 has 8 divisors (see below), whose sum is σ = 22573728. Its totient is φ = 19505920.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022319 is 91322012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022319 - 2⁸ = 21022063 is a prime.

It is a super-2 number, since 2×21022319² = 883875792275522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7502 + ... + 9915.

It is an arithmetic number, because the mean of its divisors is an integer number (2821716).

Almost surely, 2^21022319 is an apocalyptic number.

21022319 is a deficient number, since it is larger than the sum of its proper divisors (1551409).

21022319 is a wasteful number, since it uses less digits than its factorization.

21022319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17505.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21022319 is about 4585.0102508064. The cubic root of 21022319 is about 275.9901233951.

The spelling of 21022319 in words is "twenty-one million, twenty-two thousand, three hundred nineteen".