21013022323 has 8 divisors (see below), whose sum is σ = 21128307200. Its totient is φ = 20897834760.

The previous prime is 21013022309. The next prime is 21013022347. The reversal of 21013022323 is 32322031012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013022323 - 2²¹ = 21010925171 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 21013022323.

It is not an unprimeable number, because it can be changed into a prime (21013022353) 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, 432028 + ... + 478198.

It is an arithmetic number, because the mean of its divisors is an integer number (2641038400).

Almost surely, 2^21013022323 is an apocalyptic number.

21013022323 is a deficient number, since it is larger than the sum of its proper divisors (115284877).

21013022323 is a wasteful number, since it uses less digits than its factorization.

21013022323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48657.

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

Adding to 21013022323 its reverse (32322031012), we get a palindrome (53335053335).

The spelling of 21013022323 in words is "twenty-one billion, thirteen million, twenty-two thousand, three hundred twenty-three".