212542305 has 16 divisors (see below), whose sum is σ = 351794880. Its totient is φ = 109446848.

The previous prime is 212542301. The next prime is 212542307. The reversal of 212542305 is 503245212.

It is a cyclic number.

It is not a de Polignac number, because 212542305 - 2² = 212542301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212542301) 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 15 ways as a sum of consecutive naturals, for example, 243867 + ... + 244736.

It is an arithmetic number, because the mean of its divisors is an integer number (21987180).

Almost surely, 2^212542305 is an apocalyptic number.

It is an amenable number.

212542305 is a deficient number, since it is larger than the sum of its proper divisors (139252575).

212542305 is a wasteful number, since it uses less digits than its factorization.

212542305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488640.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 212542305 is about 14578.8307144297. The cubic root of 212542305 is about 596.7811935764.

Adding to 212542305 its reverse (503245212), we get a palindrome (715787517).

The spelling of 212542305 in words is "two hundred twelve million, five hundred forty-two thousand, three hundred five".