21424269 has 8 divisors (see below), whose sum is σ = 28635232. Its totient is φ = 14248080.

The previous prime is 21424261. The next prime is 21424297. The reversal of 21424269 is 96242412.

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

It is not a de Polignac number, because 21424269 - 2³ = 21424261 is a prime.

It is a super-2 number, since 2×21424269² = 917998604368722, 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 (21424261) 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, 7219 + ... + 9744.

It is an arithmetic number, because the mean of its divisors is an integer number (3579404).

Almost surely, 2^21424269 is an apocalyptic number.

It is an amenable number.

21424269 is a deficient number, since it is larger than the sum of its proper divisors (7210963).

21424269 is a wasteful number, since it uses less digits than its factorization.

21424269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17387.

The product of its digits is 6912, while the sum is 30.

The square root of 21424269 is about 4628.6357601349. The cubic root of 21424269 is about 277.7380215755.

The spelling of 21424269 in words is "twenty-one million, four hundred twenty-four thousand, two hundred sixty-nine".