11221123111 has 16 divisors (see below), whose sum is σ = 12284213760. Its totient is φ = 10165271680.

The previous prime is 11221123073. The next prime is 11221123117. The reversal of 11221123111 is 11132112211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11221123111 - 2⁹ = 11221122599 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 (11221123117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4641375 + ... + 4643791.

It is an arithmetic number, because the mean of its divisors is an integer number (767763360).

Almost surely, 2^11221123111 is an apocalyptic number.

11221123111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11221123111 is a deficient number, since it is larger than the sum of its proper divisors (1063090649).

11221123111 is a wasteful number, since it uses less digits than its factorization.

11221123111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734.

The product of its digits is 24, while the sum is 16.

Adding to 11221123111 its reverse (11132112211), we get a palindrome (22353235322).

The spelling of 11221123111 in words is "eleven billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".