111321211 has 4 divisors (see below), whose sum is σ = 111593800. Its totient is φ = 111048624.

The previous prime is 111321179. The next prime is 111321229. The reversal of 111321211 is 112123111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111321211 - 2⁵ = 111321179 is a prime.

It is a super-3 number, since 3×111321211³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111321191 and 111321200.

It is not an unprimeable number, because it can be changed into a prime (111321811) 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, 135681 + ... + 136498.

It is an arithmetic number, because the mean of its divisors is an integer number (27898450).

Almost surely, 2^111321211 is an apocalyptic number.

111321211 is the 4719-th centered decagonal number.

111321211 is a deficient number, since it is larger than the sum of its proper divisors (272589).

111321211 is an equidigital number, since it uses as much as digits as its factorization.

111321211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272588.

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

The square root of 111321211 is about 10550.8867399854. The cubic root of 111321211 is about 481.0526824528.

Adding to 111321211 its reverse (112123111), we get a palindrome (223444322).

The spelling of 111321211 in words is "one hundred eleven million, three hundred twenty-one thousand, two hundred eleven".