21112132111223 has 4 divisors (see below), whose sum is σ = 21133609357488. Its totient is φ = 21090654864960.

The previous prime is 21112132111129. The next prime is 21112132111237. The reversal of 21112132111223 is 32211123121112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112132111223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112132111423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10738621658 + ... + 10738623623.

It is an arithmetic number, because the mean of its divisors is an integer number (5283402339372).

Almost surely, 2^{21112132111223} is an apocalyptic number.

21112132111223 is a deficient number, since it is larger than the sum of its proper divisors (21477246265).

21112132111223 is an equidigital number, since it uses as much as digits as its factorization.

21112132111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21477246264.

The product of its digits is 288, while the sum is 23.

Adding to 21112132111223 its reverse (32211123121112), we get a palindrome (53323255232335).

The spelling of 21112132111223 in words is "twenty-one trillion, one hundred twelve billion, one hundred thirty-two million, one hundred eleven thousand, two hundred twenty-three".