21899319 has 8 divisors (see below), whose sum is σ = 31445232. Its totient is φ = 13476480.

The previous prime is 21899309. The next prime is 21899327. The reversal of 21899319 is 91399812.

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

It is not a de Polignac number, because 21899319 - 2⁴ = 21899303 is a prime.

It is a super-2 number, since 2×21899319² = 959160345327522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21899309) 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, 280722 + ... + 280799.

It is an arithmetic number, because the mean of its divisors is an integer number (3930654).

Almost surely, 2^21899319 is an apocalyptic number.

21899319 is a deficient number, since it is larger than the sum of its proper divisors (9545913).

21899319 is a wasteful number, since it uses less digits than its factorization.

21899319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561537.

The product of its digits is 34992, while the sum is 42.

The square root of 21899319 is about 4679.6708217566. The cubic root of 21899319 is about 279.7758367430.

The spelling of 21899319 in words is "twenty-one million, eight hundred ninety-nine thousand, three hundred nineteen".