213241243 has 4 divisors (see below), whose sum is σ = 213447520. Its totient is φ = 213034968.

The previous prime is 213241213. The next prime is 213241247. The reversal of 213241243 is 342142312.

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 213241243 - 2¹⁷ = 213110171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213241247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101580 + ... + 103657.

It is an arithmetic number, because the mean of its divisors is an integer number (53361880).

Almost surely, 2^213241243 is an apocalyptic number.

213241243 is a deficient number, since it is larger than the sum of its proper divisors (206277).

213241243 is a wasteful number, since it uses less digits than its factorization.

213241243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206276.

The product of its digits is 1152, while the sum is 22.

The square root of 213241243 is about 14602.7820294627. The cubic root of 213241243 is about 597.4346425713.

Adding to 213241243 its reverse (342142312), we get a palindrome (555383555).

The spelling of 213241243 in words is "two hundred thirteen million, two hundred forty-one thousand, two hundred forty-three".