21112220222123 has 4 divisors (see below), whose sum is σ = 21115578303840. Its totient is φ = 21108862140408.

The previous prime is 21112220222117. The next prime is 21112220222183. The reversal of 21112220222123 is 32122202221112.

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 21112220222123 - 2⁶ = 21112220222059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112220222113) 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, 1679031428 + ... + 1679044001.

It is an arithmetic number, because the mean of its divisors is an integer number (5278894575960).

Almost surely, 2^{21112220222123} is an apocalyptic number.

21112220222123 is a deficient number, since it is larger than the sum of its proper divisors (3358081717).

21112220222123 is an equidigital number, since it uses as much as digits as its factorization.

21112220222123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358081716.

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

Adding to 21112220222123 its reverse (32122202221112), we get a palindrome (53234422443235).

The spelling of 21112220222123 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-three".