213540533 has 4 divisors (see below), whose sum is σ = 222824928. Its totient is φ = 204256140.

The previous prime is 213540521. The next prime is 213540541. The reversal of 213540533 is 335045312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213540533 - 2⁴ = 213540517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213540583) 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, 4642163 + ... + 4642208.

It is an arithmetic number, because the mean of its divisors is an integer number (55706232).

Almost surely, 2^213540533 is an apocalyptic number.

213540533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

213540533 is a deficient number, since it is larger than the sum of its proper divisors (9284395).

213540533 is an equidigital number, since it uses as much as digits as its factorization.

213540533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9284394.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 213540533 is about 14613.0261410839. The cubic root of 213540533 is about 597.7140172734.

Adding to 213540533 its reverse (335045312), we get a palindrome (548585845).

The spelling of 213540533 in words is "two hundred thirteen million, five hundred forty thousand, five hundred thirty-three".