222111 has 24 divisors (see below), whose sum is σ = 355680. Its totient is φ = 133056.

The previous prime is 222109. The next prime is 222113. The reversal of 222111 is 111222.

222111 is a nontrivial binomial coefficient, being equal to C(667, 2).

It is an interprime number because it is at equal distance from previous prime (222109) and next prime (222113).

It is not a de Polignac number, because 222111 - 2¹ = 222109 is a prime.

It is a super-3 number, since 3×222111³ = 32872403337460893, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 10 and base 12.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 222093 and 222102.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 222111.

It is not an unprimeable number, because it can be changed into a prime (222113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5985 + ... + 6021.

It is an arithmetic number, because the mean of its divisors is an integer number (14820).

2²²²¹¹¹ is an apocalyptic number.

222111 is the 666-th triangular number.

222111 is a deficient number, since it is larger than the sum of its proper divisors (133569).

222111 is a wasteful number, since it uses less digits than its factorization.

222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 92 counting only the distinct ones).

The product of its digits is 8, while the sum is 9.

The square root of 222111 is about 471.2865370451. The cubic root of 222111 is about 60.5605795319.

Adding to 222111 its reverse (111222), we get a palindrome (333333).

Subtracting from 222111 its reverse (111222), we obtain a square (110889 = 333²).

It can be divided in two parts, 222 and 111, that multiplied together give a palindrome (24642).

The spelling of 222111 in words is "two hundred twenty-two thousand, one hundred eleven", and thus it is an iban number.