21002023002223 has 4 divisors (see below), whose sum is σ = 21002044106520. Its totient is φ = 21002001897928.

The previous prime is 21002023002193. The next prime is 21002023002251. The reversal of 21002023002223 is 32220032020012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002023002223 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 21002023002223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002023002293) 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, 8981488 + ... + 11075701.

It is an arithmetic number, because the mean of its divisors is an integer number (5250511026630).

Almost surely, 2^{21002023002223} is an apocalyptic number.

21002023002223 is a deficient number, since it is larger than the sum of its proper divisors (21104297).

21002023002223 is a wasteful number, since it uses less digits than its factorization.

21002023002223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21104296.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21002023002223 its reverse (32220032020012), we get a palindrome (53222055022235).

The spelling of 21002023002223 in words is "twenty-one trillion, two billion, twenty-three million, two thousand, two hundred twenty-three".