21132269 has 4 divisors (see below), whose sum is σ = 21447744. Its totient is φ = 20816796.

The previous prime is 21132257. The next prime is 21132277. The reversal of 21132269 is 96223112.

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 21132269 - 2¹⁶ = 21066733 is a prime.

It is a super-2 number, since 2×21132269² = 893145586176722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132229) 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, 157637 + ... + 157770.

It is an arithmetic number, because the mean of its divisors is an integer number (5361936).

Almost surely, 2^21132269 is an apocalyptic number.

It is an amenable number.

21132269 is a deficient number, since it is larger than the sum of its proper divisors (315475).

21132269 is an equidigital number, since it uses as much as digits as its factorization.

21132269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315474.

The product of its digits is 1296, while the sum is 26.

The square root of 21132269 is about 4596.9847726526. The cubic root of 21132269 is about 276.4704440807.

The spelling of 21132269 in words is "twenty-one million, one hundred thirty-two thousand, two hundred sixty-nine".