21110112323 has 4 divisors (see below), whose sum is σ = 21114499560. Its totient is φ = 21105725088.

The previous prime is 21110112319. The next prime is 21110112329. The reversal of 21110112323 is 32321101112.

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 21110112323 - 2² = 21110112319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110112329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186393 + ... + 2196026.

It is an arithmetic number, because the mean of its divisors is an integer number (5278624890).

Almost surely, 2^21110112323 is an apocalyptic number.

21110112323 is a deficient number, since it is larger than the sum of its proper divisors (4387237).

21110112323 is an equidigital number, since it uses as much as digits as its factorization.

21110112323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387236.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21110112323 its reverse (32321101112), we get a palindrome (53431213435).

The spelling of 21110112323 in words is "twenty-one billion, one hundred ten million, one hundred twelve thousand, three hundred twenty-three".