212640243 has 8 divisors (see below), whose sum is σ = 287513856. Its totient is φ = 139763400.

The previous prime is 212640223. The next prime is 212640247. The reversal of 212640243 is 342046212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212640243 - 2⁶ = 212640179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212640247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498943 + ... + 499368.

It is an arithmetic number, because the mean of its divisors is an integer number (35939232).

Almost surely, 2^212640243 is an apocalyptic number.

212640243 is a deficient number, since it is larger than the sum of its proper divisors (74873613).

212640243 is an equidigital number, since it uses as much as digits as its factorization.

212640243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998385.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 212640243 is about 14582.1892389312. The cubic root of 212640243 is about 596.8728436935.

Adding to 212640243 its reverse (342046212), we get a palindrome (554686455).

The spelling of 212640243 in words is "two hundred twelve million, six hundred forty thousand, two hundred forty-three".