1223012111 has 4 divisors (see below), whose sum is σ = 1223082072. Its totient is φ = 1222942152.

The previous prime is 1223012081. The next prime is 1223012123. The reversal of 1223012111 is 1112103221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1112103221 = 8311 ⋅133811.

It is a cyclic number.

It is not a de Polignac number, because 1223012111 - 2¹⁴ = 1222995727 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 (1223012611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16340 + ... + 52086.

It is an arithmetic number, because the mean of its divisors is an integer number (305770518).

Almost surely, 2^1223012111 is an apocalyptic number.

1223012111 is a deficient number, since it is larger than the sum of its proper divisors (69961).

1223012111 is an equidigital number, since it uses as much as digits as its factorization.

1223012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69960.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1223012111 is about 34971.5900553578. The cubic root of 1223012111 is about 1069.4083872504.

Adding to 1223012111 its reverse (1112103221), we get a palindrome (2335115332).

The spelling of 1223012111 in words is "one billion, two hundred twenty-three million, twelve thousand, one hundred eleven".