21332323 has 4 divisors (see below), whose sum is σ = 21352968. Its totient is φ = 21311680.

The previous prime is 21332261. The next prime is 21332329. The reversal of 21332323 is 32323312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21332323 - 2¹⁷ = 21201251 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 21332323.

It is not an unprimeable number, because it can be changed into a prime (21332329) 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, 8686 + ... + 10867.

It is an arithmetic number, because the mean of its divisors is an integer number (5338242).

Almost surely, 2^21332323 is an apocalyptic number.

21332323 is a deficient number, since it is larger than the sum of its proper divisors (20645).

21332323 is a wasteful number, since it uses less digits than its factorization.

21332323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20644.

The product of its digits is 648, while the sum is 19.

The square root of 21332323 is about 4618.6927804304. The cubic root of 21332323 is about 277.3401313836.

Adding to 21332323 its reverse (32323312), we get a palindrome (53655635).

The spelling of 21332323 in words is "twenty-one million, three hundred thirty-two thousand, three hundred twenty-three".