21110223223 has 4 divisors (see below), whose sum is σ = 21113855608. Its totient is φ = 21106590840.

The previous prime is 21110223221. The next prime is 21110223259. The reversal of 21110223223 is 32232201112.

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 21110223223 - 2¹ = 21110223221 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 21110223223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110223221) 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, 1807461 + ... + 1819102.

It is an arithmetic number, because the mean of its divisors is an integer number (5278463902).

Almost surely, 2^21110223223 is an apocalyptic number.

21110223223 is a deficient number, since it is larger than the sum of its proper divisors (3632385).

21110223223 is an equidigital number, since it uses as much as digits as its factorization.

21110223223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632384.

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

Adding to 21110223223 its reverse (32232201112), we get a palindrome (53342424335).

The spelling of 21110223223 in words is "twenty-one billion, one hundred ten million, two hundred twenty-three thousand, two hundred twenty-three".