21323099 has 8 divisors (see below), whose sum is σ = 24769248. Its totient is φ = 17976960.

The previous prime is 21323089. The next prime is 21323129. The reversal of 21323099 is 99032312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21323099 - 2¹⁶ = 21257563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21323059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24542 + ... + 25395.

It is an arithmetic number, because the mean of its divisors is an integer number (3096156).

Almost surely, 2^21323099 is an apocalyptic number.

21323099 is a deficient number, since it is larger than the sum of its proper divisors (3446149).

21323099 is an equidigital number, since it uses as much as digits as its factorization.

21323099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50005.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 21323099 is about 4617.6941215286. The cubic root of 21323099 is about 277.3001520812.

The spelling of 21323099 in words is "twenty-one million, three hundred twenty-three thousand, ninety-nine".