21302323 has 8 divisors (see below), whose sum is σ = 24409440. Its totient is φ = 18211200.

The previous prime is 21302321. The next prime is 21302371. The reversal of 21302323 is 32320312.

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

It is not a de Polignac number, because 21302323 - 2¹ = 21302321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302297 and 21302306.

It is not an unprimeable number, because it can be changed into a prime (21302321) 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, 988 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (3051180).

Almost surely, 2^21302323 is an apocalyptic number.

21302323 is a deficient number, since it is larger than the sum of its proper divisors (3107117).

21302323 is an equidigital number, since it uses as much as digits as its factorization.

21302323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7997.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21302323 is about 4615.4439656440. The cubic root of 21302323 is about 277.2100610474.

Adding to 21302323 its reverse (32320312), we get a palindrome (53622635).

The spelling of 21302323 in words is "twenty-one million, three hundred two thousand, three hundred twenty-three".