213100243 has 2 divisors, whose sum is σ = 213100244. Its totient is φ = 213100242.

The previous prime is 213100201. The next prime is 213100249. The reversal of 213100243 is 342001312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213100243 - 2¹⁷ = 212969171 is a prime.

It is not a weakly prime, because it can be changed into another prime (213100249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106550121 + 106550122.

It is an arithmetic number, because the mean of its divisors is an integer number (106550122).

Almost surely, 2^213100243 is an apocalyptic number.

213100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

213100243 is an equidigital number, since it uses as much as digits as its factorization.

213100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213100243 is about 14597.9533839508. The cubic root of 213100243 is about 597.3029343755.

Adding to 213100243 its reverse (342001312), we get a palindrome (555101555).

The spelling of 213100243 in words is "two hundred thirteen million, one hundred thousand, two hundred forty-three".