212212243 has 2 divisors, whose sum is σ = 212212244. Its totient is φ = 212212242.

The previous prime is 212212219. The next prime is 212212261. The reversal of 212212243 is 342212212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212212243 is a prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 212212243.

It is not a weakly prime, because it can be changed into another prime (212212213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106106121 + 106106122.

It is an arithmetic number, because the mean of its divisors is an integer number (106106122).

Almost surely, 2^212212243 is an apocalyptic number.

212212243 is a deficient number, since it is larger than the sum of its proper divisors (1).

212212243 is an equidigital number, since it uses as much as digits as its factorization.

212212243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 212212243 is about 14567.5064098150. The cubic root of 212212243 is about 596.4721149600.

Adding to 212212243 its reverse (342212212), we get a palindrome (554424455).

It can be divided in two parts, 2122 and 12243, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 212212243 in words is "two hundred twelve million, two hundred twelve thousand, two hundred forty-three".