212311117 has 4 divisors (see below), whose sum is σ = 219632220. Its totient is φ = 204990016.

The previous prime is 212311103. The next prime is 212311129. The reversal of 212311117 is 711113212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65755881 + 146555236 = 8109^2 + 12106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212311117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212311094 and 212311103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212311417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660508 + ... + 3660565.

It is an arithmetic number, because the mean of its divisors is an integer number (54908055).

Almost surely, 2^212311117 is an apocalyptic number.

It is an amenable number.

212311117 is a deficient number, since it is larger than the sum of its proper divisors (7321103).

212311117 is an equidigital number, since it uses as much as digits as its factorization.

212311117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321102.

The product of its digits is 84, while the sum is 19.

The square root of 212311117 is about 14570.8996633701. The cubic root of 212311117 is about 596.5647367399.

Adding to 212311117 its reverse (711113212), we get a palindrome (923424329).

The spelling of 212311117 in words is "two hundred twelve million, three hundred eleven thousand, one hundred seventeen".