1220323111 has 4 divisors (see below), whose sum is σ = 1394654992. Its totient is φ = 1045991232.

The previous prime is 1220323067. The next prime is 1220323129. The reversal of 1220323111 is 1113230221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1113230221 = 29 ⋅38387249.

It is a cyclic number.

It is not a de Polignac number, because 1220323111 - 2⁹ = 1220322599 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 (1220323141) 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, 87165930 + ... + 87165943.

It is an arithmetic number, because the mean of its divisors is an integer number (348663748).

Almost surely, 2^1220323111 is an apocalyptic number.

1220323111 is a deficient number, since it is larger than the sum of its proper divisors (174331881).

1220323111 is an equidigital number, since it uses as much as digits as its factorization.

1220323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174331880.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220323111 is about 34933.1234074481. The cubic root of 1220323111 is about 1068.6240534370.

Adding to 1220323111 its reverse (1113230221), we get a palindrome (2333553332).

The spelling of 1220323111 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, one hundred eleven".