21112244123 has 4 divisors (see below), whose sum is σ = 21793284288. Its totient is φ = 20431203960.

The previous prime is 21112244113. The next prime is 21112244129. The reversal of 21112244123 is 32144221112.

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 21112244123 - 2¹² = 21112240027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112244129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340520036 + ... + 340520097.

It is an arithmetic number, because the mean of its divisors is an integer number (5448321072).

Almost surely, 2^21112244123 is an apocalyptic number.

21112244123 is a deficient number, since it is larger than the sum of its proper divisors (681040165).

21112244123 is an equidigital number, since it uses as much as digits as its factorization.

21112244123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681040164.

The product of its digits is 768, while the sum is 23.

Adding to 21112244123 its reverse (32144221112), we get a palindrome (53256465235).

The spelling of 21112244123 in words is "twenty-one billion, one hundred twelve million, two hundred forty-four thousand, one hundred twenty-three".