21120111223 has 8 divisors (see below), whose sum is σ = 21148534400. Its totient is φ = 21091709880.

The previous prime is 21120111209. The next prime is 21120111227. The reversal of 21120111223 is 32211102112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120111223 - 2²⁹ = 20583240311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120111197 and 21120111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120111227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2809636 + ... + 2817142.

It is an arithmetic number, because the mean of its divisors is an integer number (2643566800).

Almost surely, 2^21120111223 is an apocalyptic number.

21120111223 is a deficient number, since it is larger than the sum of its proper divisors (28423177).

21120111223 is a wasteful number, since it uses less digits than its factorization.

21120111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120111223 its reverse (32211102112), we get a palindrome (53331213335).

The spelling of 21120111223 in words is "twenty-one billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-three".