111220423 has 4 divisors (see below), whose sum is σ = 115055640. Its totient is φ = 107385208.

The previous prime is 111220411. The next prime is 111220427. The reversal of 111220423 is 324022111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220397 and 111220406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917565 + ... + 1917622.

It is an arithmetic number, because the mean of its divisors is an integer number (28763910).

Almost surely, 2^111220423 is an apocalyptic number.

111220423 is a deficient number, since it is larger than the sum of its proper divisors (3835217).

111220423 is an equidigital number, since it uses as much as digits as its factorization.

111220423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3835216.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 111220423 is about 10546.1093773960. The cubic root of 111220423 is about 480.9074601214.

Adding to 111220423 its reverse (324022111), we get a palindrome (435242534).

The spelling of 111220423 in words is "one hundred eleven million, two hundred twenty thousand, four hundred twenty-three".