21923329 has 4 divisors (see below), whose sum is σ = 21938176. Its totient is φ = 21908484.

The previous prime is 21923311. The next prime is 21923381. The reversal of 21923329 is 92332912.

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 21923329 - 2¹¹ = 21921281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21923329.

It is not an unprimeable number, because it can be changed into a prime (21923389) 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, 4929 + ... + 8254.

It is an arithmetic number, because the mean of its divisors is an integer number (5484544).

Almost surely, 2^21923329 is an apocalyptic number.

It is an amenable number.

21923329 is a deficient number, since it is larger than the sum of its proper divisors (14847).

21923329 is a wasteful number, since it uses less digits than its factorization.

21923329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14846.

The product of its digits is 5832, while the sum is 31.

The square root of 21923329 is about 4682.2354703710. The cubic root of 21923329 is about 279.8780463808.

The spelling of 21923329 in words is "twenty-one million, nine hundred twenty-three thousand, three hundred twenty-nine".