211225117 has 2 divisors, whose sum is σ = 211225118. Its totient is φ = 211225116.

The previous prime is 211225111. The next prime is 211225121. The reversal of 211225117 is 711522112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185123236 + 26101881 = 13606^2 + 5109^2 .

It is a cyclic number.

It is not a de Polignac number, because 211225117 - 2²³ = 202836509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211225111) 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, 105612558 + 105612559.

It is an arithmetic number, because the mean of its divisors is an integer number (105612559).

Almost surely, 2^211225117 is an apocalyptic number.

It is an amenable number.

211225117 is a deficient number, since it is larger than the sum of its proper divisors (1).

211225117 is an equidigital number, since it uses as much as digits as its factorization.

211225117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 22.

The square root of 211225117 is about 14533.5858273174. The cubic root of 211225117 is about 595.5458277767.

Adding to 211225117 its reverse (711522112), we get a palindrome (922747229).

The spelling of 211225117 in words is "two hundred eleven million, two hundred twenty-five thousand, one hundred seventeen".