212242565 has 8 divisors (see below), whose sum is σ = 254774808. Its totient is φ = 169738240.

The previous prime is 212242531. The next prime is 212242567. The reversal of 212242565 is 565242212.

It can be written as a sum of positive squares in 4 ways, for example, as 105719524 + 106523041 = 10282^2 + 10321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212242565 - 2¹² = 212238469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212242567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17669 + ... + 27141.

It is an arithmetic number, because the mean of its divisors is an integer number (31846851).

Almost surely, 2^212242565 is an apocalyptic number.

It is an amenable number.

212242565 is a deficient number, since it is larger than the sum of its proper divisors (42532243).

212242565 is an equidigital number, since it uses as much as digits as its factorization.

212242565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13959.

The product of its digits is 9600, while the sum is 29.

The square root of 212242565 is about 14568.5471135594. The cubic root of 212242565 is about 596.5005226300.

Adding to 212242565 its reverse (565242212), we get a palindrome (777484777).

The spelling of 212242565 in words is "two hundred twelve million, two hundred forty-two thousand, five hundred sixty-five".