213840533 has 4 divisors (see below), whose sum is σ = 215957868. Its totient is φ = 211723200.

The previous prime is 213840509. The next prime is 213840547. The reversal of 213840533 is 335048312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109453444 + 104387089 = 10462^2 + 10217^2 .

It is a cyclic number.

It is not a de Polignac number, because 213840533 - 2⁶ = 213840469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213840496 and 213840505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213840593) 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, 1058516 + ... + 1058717.

It is an arithmetic number, because the mean of its divisors is an integer number (53989467).

Almost surely, 2^213840533 is an apocalyptic number.

It is an amenable number.

213840533 is a deficient number, since it is larger than the sum of its proper divisors (2117335).

213840533 is a wasteful number, since it uses less digits than its factorization.

213840533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117334.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 213840533 is about 14623.2873527125. The cubic root of 213840533 is about 597.9937928835.

Adding to 213840533 its reverse (335048312), we get a palindrome (548888845).

The spelling of 213840533 in words is "two hundred thirteen million, eight hundred forty thousand, five hundred thirty-three".