21884269 has 4 divisors (see below), whose sum is σ = 23873760. Its totient is φ = 19894780.

The previous prime is 21884263. The next prime is 21884273. The reversal of 21884269 is 96248812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21884269 - 2⁷ = 21884141 is a prime.

It is a super-2 number, since 2×21884269² = 957842459328722, 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 (21884263) 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, 994729 + ... + 994750.

It is an arithmetic number, because the mean of its divisors is an integer number (5968440).

Almost surely, 2^21884269 is an apocalyptic number.

It is an amenable number.

21884269 is a deficient number, since it is larger than the sum of its proper divisors (1989491).

21884269 is a wasteful number, since it uses less digits than its factorization.

21884269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989490.

The product of its digits is 55296, while the sum is 40.

The square root of 21884269 is about 4678.0625263030. The cubic root of 21884269 is about 279.7117313817.

The spelling of 21884269 in words is "twenty-one million, eight hundred eighty-four thousand, two hundred sixty-nine".