201121117 has 2 divisors, whose sum is σ = 201121118. Its totient is φ = 201121116.

The previous prime is 201121111. The next prime is 201121133. The reversal of 201121117 is 711121102.

It is an a-pointer prime, because the next prime (201121133) can be obtained adding 201121117 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197514916 + 3606201 = 14054^2 + 1899^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121117 - 2⁷ = 201120989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560558 + 100560559.

It is an arithmetic number, because the mean of its divisors is an integer number (100560559).

Almost surely, 2^201121117 is an apocalyptic number.

It is an amenable number.

201121117 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121117 is an equidigital number, since it uses as much as digits as its factorization.

201121117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 201121117 is about 14181.7177027326. The cubic root of 201121117 is about 585.8942341936.

Adding to 201121117 its reverse (711121102), we get a palindrome (912242219).

The spelling of 201121117 in words is "two hundred one million, one hundred twenty-one thousand, one hundred seventeen".