21893269 has 4 divisors (see below), whose sum is σ = 21917196. Its totient is φ = 21869344.

The previous prime is 21893257. The next prime is 21893279. The reversal of 21893269 is 96239812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10804369 + 11088900 = 3287^2 + 3330^2 .

It is a cyclic number.

It is not a de Polignac number, because 21893269 - 2⁵ = 21893237 is a prime.

It is a super-2 number, since 2×21893269² = 958630455012722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10534 + ... + 12439.

It is an arithmetic number, because the mean of its divisors is an integer number (5479299).

Almost surely, 2^21893269 is an apocalyptic number.

It is an amenable number.

21893269 is a deficient number, since it is larger than the sum of its proper divisors (23927).

21893269 is an equidigital number, since it uses as much as digits as its factorization.

21893269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23926.

The product of its digits is 46656, while the sum is 40.

The square root of 21893269 is about 4679.0243641169. The cubic root of 21893269 is about 279.7500703450.

The spelling of 21893269 in words is "twenty-one million, eight hundred ninety-three thousand, two hundred sixty-nine".