111123221 has 8 divisors (see below), whose sum is σ = 121406688. Its totient is φ = 100870000.

The previous prime is 111123197. The next prime is 111123253. The reversal of 111123221 is 122321111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-111123221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111123196 and 111123205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111123121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 14916.

It is an arithmetic number, because the mean of its divisors is an integer number (15175836).

Almost surely, 2^111123221 is an apocalyptic number.

111123221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111123221 is a deficient number, since it is larger than the sum of its proper divisors (10283467).

111123221 is a wasteful number, since it uses less digits than its factorization.

111123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15123.

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

The square root of 111123221 is about 10541.4999407105. The cubic root of 111123221 is about 480.7673216167.

Adding to 111123221 its reverse (122321111), we get a palindrome (233444332).

The spelling of 111123221 in words is "one hundred eleven million, one hundred twenty-three thousand, two hundred twenty-one".