12121211 has 2 divisors, whose sum is σ = 12121212. Its totient is φ = 12121210.

The previous prime is 12121157. The next prime is 12121231. The reversal of 12121211 is 11212121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12121211 - 2⁶ = 12121147 is a prime.

It is a super-2 number, since 2×12121211² = 293847512213042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121192 and 12121201.

It is not a weakly prime, because it can be changed into another prime (12121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060605 + 6060606.

It is an arithmetic number, because the mean of its divisors is an integer number (6060606).

Almost surely, 2^12121211 is an apocalyptic number.

12121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121211 is an equidigital number, since it uses as much as digits as its factorization.

12121211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8, while the sum is 11.

The square root of 12121211 is about 3481.5529580921. The cubic root of 12121211 is about 229.7111117781.

Adding to 12121211 its reverse (11212121), we get a palindrome (23333332).

It can be divided in two parts, 1 and 2121211, that added together give a palindrome (2121212).

The spelling of 12121211 in words is "twelve million, one hundred twenty-one thousand, two hundred eleven".