212424005 has 4 divisors (see below), whose sum is σ = 254908812. Its totient is φ = 169939200.

The previous prime is 212424001. The next prime is 212424011. The reversal of 212424005 is 500424212.

It is a happy number.

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 133587364 + 78836641 = 11558^2 + 8879^2 .

It is not a de Polignac number, because 212424005 - 2² = 212424001 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 (212424001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21242396 + ... + 21242405.

It is an arithmetic number, because the mean of its divisors is an integer number (63727203).

Almost surely, 2^212424005 is an apocalyptic number.

It is an amenable number.

212424005 is a deficient number, since it is larger than the sum of its proper divisors (42484807).

212424005 is an equidigital number, since it uses as much as digits as its factorization.

212424005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42484806.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 212424005 is about 14574.7728970300. The cubic root of 212424005 is about 596.6704512034.

Adding to 212424005 its reverse (500424212), we get a palindrome (712848217).

The spelling of 212424005 in words is "two hundred twelve million, four hundred twenty-four thousand, five".