212243617 has 2 divisors, whose sum is σ = 212243618. Its totient is φ = 212243616.

The previous prime is 212243599. The next prime is 212243621. The reversal of 212243617 is 716342212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208398096 + 3845521 = 14436^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 212243617 - 2¹¹ = 212241569 is a prime.

It is not a weakly prime, because it can be changed into another prime (212243627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106121808 + 106121809.

It is an arithmetic number, because the mean of its divisors is an integer number (106121809).

Almost surely, 2^212243617 is an apocalyptic number.

It is an amenable number.

212243617 is a deficient number, since it is larger than the sum of its proper divisors (1).

212243617 is an equidigital number, since it uses as much as digits as its factorization.

212243617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 212243617 is about 14568.5832186936. The cubic root of 212243617 is about 596.5015081652.

Adding to 212243617 its reverse (716342212), we get a palindrome (928585829).

The spelling of 212243617 in words is "two hundred twelve million, two hundred forty-three thousand, six hundred seventeen".