21260323 has 4 divisors (see below), whose sum is σ = 24297520. Its totient is φ = 18223128.

The previous prime is 21260321. The next prime is 21260329. The reversal of 21260323 is 32306212.

21260323 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 21260323 - 2¹ = 21260321 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 21260323.

It is not an unprimeable number, because it can be changed into a prime (21260321) 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, 1518588 + ... + 1518601.

It is an arithmetic number, because the mean of its divisors is an integer number (6074380).

Almost surely, 2^21260323 is an apocalyptic number.

21260323 is a deficient number, since it is larger than the sum of its proper divisors (3037197).

21260323 is an equidigital number, since it uses as much as digits as its factorization.

21260323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037196.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 21260323 is about 4610.8917792549. The cubic root of 21260323 is about 277.0277572570.

Adding to 21260323 its reverse (32306212), we get a palindrome (53566535).

The spelling of 21260323 in words is "twenty-one million, two hundred sixty thousand, three hundred twenty-three".