212140243 has 4 divisors (see below), whose sum is σ = 242446000. Its totient is φ = 181834488.

The previous prime is 212140237. The next prime is 212140303. The reversal of 212140243 is 342041212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212140243 - 2²¹ = 210043091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212140243.

It is not an unprimeable number, because it can be changed into a prime (212140213) 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 3 ways as a sum of consecutive naturals, for example, 15152868 + ... + 15152881.

It is an arithmetic number, because the mean of its divisors is an integer number (60611500).

Almost surely, 2^212140243 is an apocalyptic number.

212140243 is a deficient number, since it is larger than the sum of its proper divisors (30305757).

212140243 is an equidigital number, since it uses as much as digits as its factorization.

212140243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30305756.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212140243 is about 14565.0349467483. The cubic root of 212140243 is about 596.4046497194.

Adding to 212140243 its reverse (342041212), we get a palindrome (554181455).

The spelling of 212140243 in words is "two hundred twelve million, one hundred forty thousand, two hundred forty-three".