21201322223 has 8 divisors (see below), whose sum is σ = 21306208896. Its totient is φ = 21096682200.

The previous prime is 21201322213. The next prime is 21201322243. The reversal of 21201322223 is 32222310212.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21201322223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201322195 and 21201322204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201322213) 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, 111878 + ... + 234348.

It is an arithmetic number, because the mean of its divisors is an integer number (2663276112).

Almost surely, 2^21201322223 is an apocalyptic number.

21201322223 is a deficient number, since it is larger than the sum of its proper divisors (104886673).

21201322223 is a wasteful number, since it uses less digits than its factorization.

21201322223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123325.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21201322223 its reverse (32222310212), we get a palindrome (53423632435).

The spelling of 21201322223 in words is "twenty-one billion, two hundred one million, three hundred twenty-two thousand, two hundred twenty-three".