212542005 has 24 divisors (see below), whose sum is σ = 368242848. Its totient is φ = 104634816.

The previous prime is 212541977. The next prime is 212542021. The reversal of 212542005 is 500245212.

It is a happy number.

It is not a de Polignac number, because 212542005 - 2⁷ = 212541877 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 39387 + ... + 44456.

It is an arithmetic number, because the mean of its divisors is an integer number (15343452).

Almost surely, 2^212542005 is an apocalyptic number.

It is an amenable number.

212542005 is a deficient number, since it is larger than the sum of its proper divisors (155700843).

212542005 is a wasteful number, since it uses less digits than its factorization.

212542005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83877 (or 83864 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212542005 is about 14578.8204255351. The cubic root of 212542005 is about 596.7809127940.

Adding to 212542005 its reverse (500245212), we get a palindrome (712787217).

The spelling of 212542005 in words is "two hundred twelve million, five hundred forty-two thousand, five".