1223100111 has 4 divisors (see below), whose sum is σ = 1630800152. Its totient is φ = 815400072.

The previous prime is 1223100107. The next prime is 1223100161. The reversal of 1223100111 is 1110013221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1110013221 = 3 ⋅370004407.

It is not a de Polignac number, because 1223100111 - 2² = 1223100107 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 (1223100101) 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, 203850016 + ... + 203850021.

It is an arithmetic number, because the mean of its divisors is an integer number (407700038).

Almost surely, 2^1223100111 is an apocalyptic number.

1223100111 is a deficient number, since it is larger than the sum of its proper divisors (407700041).

1223100111 is an equidigital number, since it uses as much as digits as its factorization.

1223100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407700040.

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

The square root of 1223100111 is about 34972.8481968512. The cubic root of 1223100111 is about 1069.4340358601.

Adding to 1223100111 its reverse (1110013221), we get a palindrome (2333113332).

The spelling of 1223100111 in words is "one billion, two hundred twenty-three million, one hundred thousand, one hundred eleven".