213535454243 has 4 divisors (see below), whose sum is σ = 213545361288. Its totient is φ = 213525547200.

The previous prime is 213535454227. The next prime is 213535454267. The reversal of 213535454243 is 342454535312.

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 213535454243 - 2⁴ = 213535454227 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 213535454243.

It is not an unprimeable number, because it can be changed into a prime (213535454213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4921121 + ... + 4964322.

It is an arithmetic number, because the mean of its divisors is an integer number (53386340322).

Almost surely, 2^213535454243 is an apocalyptic number.

213535454243 is a deficient number, since it is larger than the sum of its proper divisors (9907045).

213535454243 is an equidigital number, since it uses as much as digits as its factorization.

213535454243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907044.

The product of its digits is 864000, while the sum is 41.

Adding to 213535454243 its reverse (342454535312), we get a palindrome (555989989555).

The spelling of 213535454243 in words is "two hundred thirteen billion, five hundred thirty-five million, four hundred fifty-four thousand, two hundred forty-three".