213240404 has 12 divisors (see below), whose sum is σ = 401876244. Its totient is φ = 98418624.

The previous prime is 213240403. The next prime is 213240409. The reversal of 213240404 is 404042312.

213240404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 86452804 + 126787600 = 9298^2 + 11260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213240403) 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, 2050337 + ... + 2050440.

It is an arithmetic number, because the mean of its divisors is an integer number (33489687).

Almost surely, 2^213240404 is an apocalyptic number.

It is an amenable number.

213240404 is a deficient number, since it is larger than the sum of its proper divisors (188635840).

213240404 is a wasteful number, since it uses less digits than its factorization.

213240404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100794 (or 4100792 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 213240404 is about 14602.7533020318. The cubic root of 213240404 is about 597.4338590326.

Adding to 213240404 its reverse (404042312), we get a palindrome (617282716).

The spelling of 213240404 in words is "two hundred thirteen million, two hundred forty thousand, four hundred four".