111221131 has 6 divisors (see below), whose sum is σ = 129379740. Its totient is φ = 95332356.

The previous prime is 111221101. The next prime is 111221141. The reversal of 111221131 is 131122111.

It is a happy number.

It is not a de Polignac number, because 111221131 - 2¹⁷ = 111090059 is a prime.

It is a super-2 number, since 2×111221131² = 24740279961838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111221101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134861 + ... + 1134958.

It is an arithmetic number, because the mean of its divisors is an integer number (21563290).

Almost surely, 2^111221131 is an apocalyptic number.

111221131 is a deficient number, since it is larger than the sum of its proper divisors (18158609).

111221131 is an equidigital number, since it uses as much as digits as its factorization.

111221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269833 (or 2269826 counting only the distinct ones).

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

The square root of 111221131 is about 10546.1429442237. The cubic root of 111221131 is about 480.9084805628.

Adding to 111221131 its reverse (131122111), we get a palindrome (242343242).

The spelling of 111221131 in words is "one hundred eleven million, two hundred twenty-one thousand, one hundred thirty-one".