213404231 has 4 divisors (see below), whose sum is σ = 213536232. Its totient is φ = 213272232.

The previous prime is 213404209. The next prime is 213404237. The reversal of 213404231 is 132404312.

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 213404231 - 2⁶ = 213404167 is a prime.

It is a super-2 number, since 2×213404231² = 91082731617402722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213404237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63545 + ... + 66818.

It is an arithmetic number, because the mean of its divisors is an integer number (53384058).

Almost surely, 2^213404231 is an apocalyptic number.

213404231 is a deficient number, since it is larger than the sum of its proper divisors (132001).

213404231 is a wasteful number, since it uses less digits than its factorization.

213404231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132000.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 213404231 is about 14608.3616809004. The cubic root of 213404231 is about 597.5868174472.

Adding to 213404231 its reverse (132404312), we get a palindrome (345808543).

The spelling of 213404231 in words is "two hundred thirteen million, four hundred four thousand, two hundred thirty-one".