11111011111223 has 4 divisors (see below), whose sum is σ = 11111106136608. Its totient is φ = 11110916085840.

The previous prime is 11111011111217. The next prime is 11111011111247. The reversal of 11111011111223 is 32211111011111.

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 11111011111223 - 2¹⁴ = 11111011094839 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 (11111011131223) 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, 47337086 + ... + 47571227.

It is an arithmetic number, because the mean of its divisors is an integer number (2777776534152).

Almost surely, 2^{11111011111223} is an apocalyptic number.

11111011111223 is a deficient number, since it is larger than the sum of its proper divisors (95025385).

11111011111223 is an equidigital number, since it uses as much as digits as its factorization.

11111011111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95025384.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 11111011111223 its reverse (32211111011111), we get a palindrome (43322122122334).

The spelling of 11111011111223 in words is "eleven trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, two hundred twenty-three".