21202112323 has 4 divisors (see below), whose sum is σ = 24230985520. Its totient is φ = 18173239128.

The previous prime is 21202112311. The next prime is 21202112339. The reversal of 21202112323 is 32321120212.

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 21202112323 - 2⁵ = 21202112291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112323.

It is not an unprimeable number, because it can be changed into a prime (21202112303) 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, 1514436588 + ... + 1514436601.

It is an arithmetic number, because the mean of its divisors is an integer number (6057746380).

Almost surely, 2^21202112323 is an apocalyptic number.

21202112323 is a deficient number, since it is larger than the sum of its proper divisors (3028873197).

21202112323 is an equidigital number, since it uses as much as digits as its factorization.

21202112323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028873196.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21202112323 its reverse (32321120212), we get a palindrome (53523232535).

The spelling of 21202112323 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, three hundred twenty-three".