213211344 has 20 divisors (see below), whose sum is σ = 550796096. Its totient is φ = 71070432.

The previous prime is 213211267. The next prime is 213211373. The reversal of 213211344 is 443112312.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 213211344.

It is a congruent number.

It is an unprimeable number.

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, 2220904 + ... + 2220999.

Almost surely, 2^213211344 is an apocalyptic number.

213211344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213211344 is an abundant number, since it is smaller than the sum of its proper divisors (337584752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213211344 is a wasteful number, since it uses less digits than its factorization.

213211344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441914 (or 4441908 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 213211344 is about 14601.7582502930. The cubic root of 213211344 is about 597.4067187466.

Adding to 213211344 its reverse (443112312), we get a palindrome (656323656).

The spelling of 213211344 in words is "two hundred thirteen million, two hundred eleven thousand, three hundred forty-four".