213004431 has 8 divisors (see below), whose sum is σ = 315562160. Its totient is φ = 142002936.

The previous prime is 213004417. The next prime is 213004439. The reversal of 213004431 is 134400312.

It is not a de Polignac number, because 213004431 - 2⁵ = 213004399 is a prime.

It is a super-2 number, since 2×213004431² = 90741775251267522, 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 (213004439) 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 7 ways as a sum of consecutive naturals, for example, 3944500 + ... + 3944553.

It is an arithmetic number, because the mean of its divisors is an integer number (39445270).

Almost surely, 2^213004431 is an apocalyptic number.

213004431 is a deficient number, since it is larger than the sum of its proper divisors (102557729).

213004431 is an equidigital number, since it uses as much as digits as its factorization.

213004431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7889062 (or 7889056 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213004431 is about 14594.6713220956. The cubic root of 213004431 is about 597.2134031656.

Adding to 213004431 its reverse (134400312), we get a palindrome (347404743).

The spelling of 213004431 in words is "two hundred thirteen million, four thousand, four hundred thirty-one".