21110232223 has 12 divisors (see below), whose sum is σ = 21838024224. Its totient is φ = 20405985600.

The previous prime is 21110232217. The next prime is 21110232263. The reversal of 21110232223 is 32223201112.

It is a de Polignac number, because none of the positive numbers 2^k-21110232223 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 21110232223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110232263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 863415 + ... + 887527.

It is an arithmetic number, because the mean of its divisors is an integer number (1819835352).

Almost surely, 2^21110232223 is an apocalyptic number.

21110232223 is a deficient number, since it is larger than the sum of its proper divisors (727792001).

21110232223 is an equidigital number, since it uses as much as digits as its factorization.

21110232223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25086 (or 25055 counting only the distinct ones).

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

Adding to 21110232223 its reverse (32223201112), we get a palindrome (53333433335).

The spelling of 21110232223 in words is "twenty-one billion, one hundred ten million, two hundred thirty-two thousand, two hundred twenty-three".