213040321 has 4 divisors (see below), whose sum is σ = 229428052. Its totient is φ = 196652592.

The previous prime is 213040319. The next prime is 213040357. The reversal of 213040321 is 123040312.

It is a happy number.

213040321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 25897921 + 187142400 = 5089^2 + 13680^2 .

It is a cyclic number.

It is not a de Polignac number, because 213040321 - 2¹ = 213040319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213040295 and 213040304.

It is not an unprimeable number, because it can be changed into a prime (213040301) 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, 8193846 + ... + 8193871.

It is an arithmetic number, because the mean of its divisors is an integer number (57357013).

Almost surely, 2^213040321 is an apocalyptic number.

It is an amenable number.

213040321 is a deficient number, since it is larger than the sum of its proper divisors (16387731).

213040321 is a wasteful number, since it uses less digits than its factorization.

213040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16387730.

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

The square root of 213040321 is about 14595.9008286573. The cubic root of 213040321 is about 597.2469436029.

Adding to 213040321 its reverse (123040312), we get a palindrome (336080633).

Subtracting from 213040321 its reverse (123040312), we obtain a palindrome (90000009).

The spelling of 213040321 in words is "two hundred thirteen million, forty thousand, three hundred twenty-one".