21323002122 has 12 divisors (see below), whose sum is σ = 46199837970. Its totient is φ = 7107667368.

The previous prime is 21323002109. The next prime is 21323002123. The reversal of 21323002122 is 22120032312.

It can be written as a sum of positive squares in only one way, i.e., 20955168081 + 367834041 = 144759^2 + 19179^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1184611229 = 21323002122 / (2 + 1 + 3 + 2 + 3 + 0 + 0 + 2 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21323002095 and 21323002104.

It is not an unprimeable number, because it can be changed into a prime (21323002123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 592305597 + ... + 592305632.

Almost surely, 2^21323002122 is an apocalyptic number.

21323002122 is an abundant number, since it is smaller than the sum of its proper divisors (24876835848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323002122 is a wasteful number, since it uses less digits than its factorization.

21323002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184611237 (or 1184611234 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21323002122 its reverse (22120032312), we get a palindrome (43443034434).

The spelling of 21323002122 in words is "twenty-one billion, three hundred twenty-three million, two thousand, one hundred twenty-two".