201212117 has 2 divisors, whose sum is σ = 201212118. Its totient is φ = 201212116.

The previous prime is 201212113. The next prime is 201212159. The reversal of 201212117 is 711212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 1865956 = 14119^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 201212117 - 2² = 201212113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201212095 and 201212104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100606058 + 100606059.

It is an arithmetic number, because the mean of its divisors is an integer number (100606059).

Almost surely, 2^201212117 is an apocalyptic number.

It is an amenable number.

201212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201212117 is an equidigital number, since it uses as much as digits as its factorization.

201212117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 201212117 is about 14184.9256959633. The cubic root of 201212117 is about 585.9825861560.

Adding to 201212117 its reverse (711212102), we get a palindrome (912424219).

The spelling of 201212117 in words is "two hundred one million, two hundred twelve thousand, one hundred seventeen".