111131221 has 8 divisors (see below), whose sum is σ = 114380640. Its totient is φ = 107912112.

The previous prime is 111131213. The next prime is 111131231. The reversal of 111131221 is 122131111.

It is a happy number.

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

It is not a de Polignac number, because 111131221 - 2³ = 111131213 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 (111131201) 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 7 ways as a sum of consecutive naturals, for example, 31 + ... + 14908.

It is an arithmetic number, because the mean of its divisors is an integer number (14297580).

Almost surely, 2^111131221 is an apocalyptic number.

It is an amenable number.

111131221 is a deficient number, since it is larger than the sum of its proper divisors (3249419).

111131221 is a wasteful number, since it uses less digits than its factorization.

111131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15155.

The product of its digits is 12, while the sum is 13.

The square root of 111131221 is about 10541.8793865231. The cubic root of 111131221 is about 480.7788584982.

Adding to 111131221 its reverse (122131111), we get a palindrome (233262332).

The spelling of 111131221 in words is "one hundred eleven million, one hundred thirty-one thousand, two hundred twenty-one".