311112221 has 12 divisors (see below), whose sum is σ = 365425632. Its totient is φ = 264074328.

The previous prime is 311112157. The next prime is 311112229. The reversal of 311112221 is 122211113.

It is not a de Polignac number, because 311112221 - 2⁶ = 311112157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311112196 and 311112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311112229) 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 11 ways as a sum of consecutive naturals, for example, 25775 + ... + 35868.

It is an arithmetic number, because the mean of its divisors is an integer number (30452136).

Almost surely, 2^311112221 is an apocalyptic number.

It is an amenable number.

311112221 is a deficient number, since it is larger than the sum of its proper divisors (54313411).

311112221 is a wasteful number, since it uses less digits than its factorization.

311112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61760 (or 61753 counting only the distinct ones).

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

The square root of 311112221 is about 17638.3735361286. The cubic root of 311112221 is about 677.5983769854.

Adding to 311112221 its reverse (122211113), we get a palindrome (433323334).

The spelling of 311112221 in words is "three hundred eleven million, one hundred twelve thousand, two hundred twenty-one".