21242422223 has 4 divisors (see below), whose sum is σ = 23173551528. Its totient is φ = 19311292920.

The previous prime is 21242422177. The next prime is 21242422247. The reversal of 21242422223 is 32222424212.

It is a happy number.

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 21242422223 - 2¹⁰ = 21242421199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21242422192 and 21242422201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242422273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965564636 + ... + 965564657.

It is an arithmetic number, because the mean of its divisors is an integer number (5793387882).

Almost surely, 2^21242422223 is an apocalyptic number.

21242422223 is a deficient number, since it is larger than the sum of its proper divisors (1931129305).

21242422223 is a wasteful number, since it uses less digits than its factorization.

21242422223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931129304.

The product of its digits is 6144, while the sum is 26.

Adding to 21242422223 its reverse (32222424212), we get a palindrome (53464846435).

The spelling of 21242422223 in words is "twenty-one billion, two hundred forty-two million, four hundred twenty-two thousand, two hundred twenty-three".