12211111 has 8 divisors (see below), whose sum is σ = 13351824. Its totient is φ = 11075520.

The previous prime is 12211103. The next prime is 12211123. The reversal of 12211111 is 11111221.

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

It is a cyclic number.

It is not a de Polignac number, because 12211111 - 2³ = 12211103 is a prime.

It is a super-2 number, since 2×12211111² = 298222463708642, which contains 22 as substring.

It is a Duffinian number.

12211111 is a modest number, since divided by 11111 gives 122 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5131 + ... + 7123.

It is an arithmetic number, because the mean of its divisors is an integer number (1668978).

Almost surely, 2^12211111 is an apocalyptic number.

12211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12211111 is a deficient number, since it is larger than the sum of its proper divisors (1140713).

12211111 is a wasteful number, since it uses less digits than its factorization.

12211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561.

The product of its digits is 4, while the sum is 10.

The square root of 12211111 is about 3494.4400123625. The cubic root of 12211111 is about 230.2776168842.

Adding to 12211111 its reverse (11111221), we get a palindrome (23322332).

It can be divided in two parts, 1221 and 1111, that multiplied together give a palindrome (1356531).

The spelling of 12211111 in words is "twelve million, two hundred eleven thousand, one hundred eleven".