212543345 has 16 divisors (see below), whose sum is σ = 304162560. Its totient is φ = 139406784.

The previous prime is 212543341. The next prime is 212543411. The reversal of 212543345 is 543345212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212543345 - 2² = 212543341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212543341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131210 + ... + 132819.

It is an arithmetic number, because the mean of its divisors is an integer number (19010160).

Almost surely, 2^212543345 is an apocalyptic number.

It is an amenable number.

212543345 is a deficient number, since it is larger than the sum of its proper divisors (91619215).

212543345 is a wasteful number, since it uses less digits than its factorization.

212543345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264064.

The product of its digits is 14400, while the sum is 29.

The square root of 212543345 is about 14578.8663825415. The cubic root of 212543345 is about 596.7821669535.

Adding to 212543345 its reverse (543345212), we get a palindrome (755888557).

The spelling of 212543345 in words is "two hundred twelve million, five hundred forty-three thousand, three hundred forty-five".