12220111 has 2 divisors, whose sum is σ = 12220112. Its totient is φ = 12220110.

The previous prime is 12220081. The next prime is 12220129. The reversal of 12220111 is 11102221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12220111 - 2¹⁹ = 11695823 is a prime.

It is a super-2 number, since 2×12220111² = 298662225704642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110055 + 6110056.

It is an arithmetic number, because the mean of its divisors is an integer number (6110056).

Almost surely, 2^12220111 is an apocalyptic number.

12220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220111 is an equidigital number, since it uses as much as digits as its factorization.

12220111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12220111 is about 3495.7275351492. The cubic root of 12220111 is about 230.3341771102.

Adding to 12220111 its reverse (11102221), we get a palindrome (23322332).

It can be divided in two parts, 122 and 20111, that multiplied together give a palindrome (2453542).

The spelling of 12220111 in words is "twelve million, two hundred twenty thousand, one hundred eleven".