2212181 has 2 divisors, whose sum is σ = 2212182. Its totient is φ = 2212180.

The previous prime is 2212169. The next prime is 2212183. The reversal of 2212181 is 1812122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 167281 = 1430^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212181 - 2¹⁸ = 1950037 is a prime.

It is a super-2 number, since 2×2212181² = 9787489553522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2212183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106090 + 1106091.

It is an arithmetic number, because the mean of its divisors is an integer number (1106091).

2^2212181 is an apocalyptic number.

It is an amenable number.

2212181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212181 is an equidigital number, since it uses as much as digits as its factorization.

2212181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 17.

The square root of 2212181 is about 1487.3402435220. The cubic root of 2212181 is about 130.2987409730.

The spelling of 2212181 in words is "two million, two hundred twelve thousand, one hundred eighty-one".