21110111223 has 8 divisors (see below), whose sum is σ = 28151364336. Its totient is φ = 14071132800.

The previous prime is 21110111219. The next prime is 21110111249. The reversal of 21110111223 is 32211101112.

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

It is not a de Polignac number, because 21110111223 - 2² = 21110111219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111203) 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, 546898 + ... + 584223.

It is an arithmetic number, because the mean of its divisors is an integer number (3518920542).

Almost surely, 2^21110111223 is an apocalyptic number.

21110111223 is a deficient number, since it is larger than the sum of its proper divisors (7041253113).

21110111223 is a wasteful number, since it uses less digits than its factorization.

21110111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137345.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21110111223 its reverse (32211101112), we get a palindrome (53321212335).

The spelling of 21110111223 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-three".