21022222223 has 4 divisors (see below), whose sum is σ = 21098115000. Its totient is φ = 20946329448.

The previous prime is 21022222217. The next prime is 21022222261. The reversal of 21022222223 is 32222222012.

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 21022222223 - 2⁶ = 21022222159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022222195 and 21022222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022222283) 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, 37945973 + ... + 37946526.

It is an arithmetic number, because the mean of its divisors is an integer number (5274528750).

Almost surely, 2^21022222223 is an apocalyptic number.

21022222223 is a deficient number, since it is larger than the sum of its proper divisors (75892777).

21022222223 is an equidigital number, since it uses as much as digits as its factorization.

21022222223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75892776.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21022222223 its reverse (32222222012), we get a palindrome (53244444235).

The spelling of 21022222223 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-three".