213443644 has 12 divisors (see below), whose sum is σ = 393185800. Its totient is φ = 101104848.

The previous prime is 213443641. The next prime is 213443677. The reversal of 213443644 is 446344312.

213443644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443641) 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, 1404159 + ... + 1404310.

Almost surely, 2^213443644 is an apocalyptic number.

It is an amenable number.

213443644 is a deficient number, since it is larger than the sum of its proper divisors (179742156).

213443644 is a wasteful number, since it uses less digits than its factorization.

213443644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808492 (or 2808490 counting only the distinct ones).

The product of its digits is 27648, while the sum is 31.

The square root of 213443644 is about 14609.7106063057. The cubic root of 213443644 is about 597.6236040334.

Adding to 213443644 its reverse (446344312), we get a palindrome (659787956).

The spelling of 213443644 in words is "two hundred thirteen million, four hundred forty-three thousand, six hundred forty-four".