21792269 has 4 divisors (see below), whose sum is σ = 21807744. Its totient is φ = 21776796.

The previous prime is 21792263. The next prime is 21792289. The reversal of 21792269 is 96229712.

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 21792269 - 2²⁰ = 20743693 is a prime.

It is a super-2 number, since 2×21792269² = 949805976336722, 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 (21792263) 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, 5387 + ... + 8520.

It is an arithmetic number, because the mean of its divisors is an integer number (5451936).

Almost surely, 2^21792269 is an apocalyptic number.

It is an amenable number.

21792269 is a deficient number, since it is larger than the sum of its proper divisors (15475).

21792269 is a wasteful number, since it uses less digits than its factorization.

21792269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15474.

The product of its digits is 27216, while the sum is 38.

The square root of 21792269 is about 4668.2190394196. The cubic root of 21792269 is about 279.3192177097.

The spelling of 21792269 in words is "twenty-one million, seven hundred ninety-two thousand, two hundred sixty-nine".