21023223223 has 4 divisors (see below), whose sum is σ = 21023519608. Its totient is φ = 21022926840.

The previous prime is 21023223211. The next prime is 21023223253. The reversal of 21023223223 is 32232232012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21023223223 - 2⁵ = 21023223191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023223194 and 21023223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023223253) 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, 28165 + ... + 206977.

It is an arithmetic number, because the mean of its divisors is an integer number (5255879902).

Almost surely, 2^21023223223 is an apocalyptic number.

21023223223 is a deficient number, since it is larger than the sum of its proper divisors (296385).

21023223223 is a wasteful number, since it uses less digits than its factorization.

21023223223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296384.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21023223223 its reverse (32232232012), we get a palindrome (53255455235).

The spelling of 21023223223 in words is "twenty-one billion, twenty-three million, two hundred twenty-three thousand, two hundred twenty-three".