12211231 has 2 divisors, whose sum is σ = 12211232. Its totient is φ = 12211230.

The previous prime is 12211223. The next prime is 12211249. The reversal of 12211231 is 13211221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12211231 - 2³ = 12211223 is a prime.

It is a super-2 number, since 2×12211231² = 298228325070722, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211261) 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 as a sum of consecutive naturals, namely, 6105615 + 6105616.

It is an arithmetic number, because the mean of its divisors is an integer number (6105616).

Almost surely, 2^12211231 is an apocalyptic number.

12211231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211231 is an equidigital number, since it uses as much as digits as its factorization.

12211231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 13.

The square root of 12211231 is about 3494.4571824534. The cubic root of 12211231 is about 230.2783712033.

Adding to 12211231 its reverse (13211221), we get a palindrome (25422452).

It can be divided in two parts, 1221 and 1231, that multiplied together give a palindrome (1503051).

The spelling of 12211231 in words is "twelve million, two hundred eleven thousand, two hundred thirty-one".