20212117 has 2 divisors, whose sum is σ = 20212118. Its totient is φ = 20212116.

The previous prime is 20212111. The next prime is 20212151. The reversal of 20212117 is 71121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12152196 + 8059921 = 3486^2 + 2839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20212117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106058 + 10106059.

It is an arithmetic number, because the mean of its divisors is an integer number (10106059).

Almost surely, 2^20212117 is an apocalyptic number.

It is an amenable number.

20212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212117 is an equidigital number, since it uses as much as digits as its factorization.

20212117 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 16.

The square root of 20212117 is about 4495.7888073174. The cubic root of 20212117 is about 272.3980125034.

Adding to 20212117 its reverse (71121202), we get a palindrome (91333319).

The spelling of 20212117 in words is "twenty million, two hundred twelve thousand, one hundred seventeen".