21220232323 has 4 divisors (see below), whose sum is σ = 21220642440. Its totient is φ = 21219822208.

The previous prime is 21220232317. The next prime is 21220232329. The reversal of 21220232323 is 32323202212.

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

It is an interprime number because it is at equal distance from previous prime (21220232317) and next prime (21220232329).

It is a cyclic number.

It is not a de Polignac number, because 21220232323 - 2⁵ = 21220232291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220232294 and 21220232303.

It is not an unprimeable number, because it can be changed into a prime (21220232329) 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, 113953 + ... + 235426.

It is an arithmetic number, because the mean of its divisors is an integer number (5305160610).

Almost surely, 2^21220232323 is an apocalyptic number.

21220232323 is a deficient number, since it is larger than the sum of its proper divisors (410117).

21220232323 is an equidigital number, since it uses as much as digits as its factorization.

21220232323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410116.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21220232323 its reverse (32323202212), we get a palindrome (53543434535).

The spelling of 21220232323 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-two thousand, three hundred twenty-three".