21469323 has 4 divisors (see below), whose sum is σ = 28625768. Its totient is φ = 14312880.

The previous prime is 21469321. The next prime is 21469339. The reversal of 21469323 is 32396412.

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

It is not a de Polignac number, because 21469323 - 2¹ = 21469321 is a prime.

It is the 4634-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21469321) by changing a digit.

It is a nontrivial repunit in base 4633.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3578218 + ... + 3578223.

It is an arithmetic number, because the mean of its divisors is an integer number (7156442).

Almost surely, 2^21469323 is an apocalyptic number.

21469323 is a deficient number, since it is larger than the sum of its proper divisors (7156445).

21469323 is an equidigital number, since it uses as much as digits as its factorization.

21469323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7156444.

The product of its digits is 7776, while the sum is 30.

The square root of 21469323 is about 4633.5000809323. The cubic root of 21469323 is about 277.9325742661.

The spelling of 21469323 in words is "twenty-one million, four hundred sixty-nine thousand, three hundred twenty-three".