212143745 has 16 divisors (see below), whose sum is σ = 278078400. Its totient is φ = 154084800.

The previous prime is 212143709. The next prime is 212143747. The reversal of 212143745 is 547341212.

It is a de Polignac number, because none of the positive numbers 2^k-212143745 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212143747) 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 15 ways as a sum of consecutive naturals, for example, 49706 + ... + 53804.

It is an arithmetic number, because the mean of its divisors is an integer number (17379900).

Almost surely, 2^212143745 is an apocalyptic number.

It is an amenable number.

212143745 is a deficient number, since it is larger than the sum of its proper divisors (65934655).

212143745 is a wasteful number, since it uses less digits than its factorization.

212143745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056.

The product of its digits is 6720, while the sum is 29.

The square root of 212143745 is about 14565.1551656685. The cubic root of 212143745 is about 596.4079315068.

Adding to 212143745 its reverse (547341212), we get a palindrome (759484957).

The spelling of 212143745 in words is "two hundred twelve million, one hundred forty-three thousand, seven hundred forty-five".