21301122223 has 4 divisors (see below), whose sum is σ = 21328189240. Its totient is φ = 21274055208.

The previous prime is 21301122203. The next prime is 21301122233. The reversal of 21301122223 is 32222110312.

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 21301122223 - 2¹³ = 21301114031 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 21301122223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301122203) 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, 13532328 + ... + 13533901.

It is an arithmetic number, because the mean of its divisors is an integer number (5332047310).

Almost surely, 2^21301122223 is an apocalyptic number.

21301122223 is a deficient number, since it is larger than the sum of its proper divisors (27067017).

21301122223 is an equidigital number, since it uses as much as digits as its factorization.

21301122223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27067016.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21301122223 its reverse (32222110312), we get a palindrome (53523232535).

The spelling of 21301122223 in words is "twenty-one billion, three hundred one million, one hundred twenty-two thousand, two hundred twenty-three".