21823369 has 4 divisors (see below), whose sum is σ = 22287744. Its totient is φ = 21358996.

The previous prime is 21823339. The next prime is 21823379. The reversal of 21823369 is 96332812.

It is a happy number.

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 21823369 - 2¹¹ = 21821321 is a prime.

It is a super-2 number, since 2×21823369² = 952518869020322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21823339) 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, 232117 + ... + 232210.

It is an arithmetic number, because the mean of its divisors is an integer number (5571936).

Almost surely, 2^21823369 is an apocalyptic number.

It is an amenable number.

21823369 is a deficient number, since it is larger than the sum of its proper divisors (464375).

21823369 is an equidigital number, since it uses as much as digits as its factorization.

21823369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464374.

The product of its digits is 15552, while the sum is 34.

The square root of 21823369 is about 4671.5488866114. The cubic root of 21823369 is about 279.4520277838.

The spelling of 21823369 in words is "twenty-one million, eight hundred twenty-three thousand, three hundred sixty-nine".