213444203213 has 4 divisors (see below), whose sum is σ = 219212965500. Its totient is φ = 207675440928.

The previous prime is 213444203209. The next prime is 213444203267. The reversal of 213444203213 is 312302444312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185232969769 + 28211233444 = 430387^2 + 167962^2 .

It is a cyclic number.

It is not a de Polignac number, because 213444203213 - 2² = 213444203209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213444203513) 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, 2884381088 + ... + 2884381161.

It is an arithmetic number, because the mean of its divisors is an integer number (54803241375).

Almost surely, 2^213444203213 is an apocalyptic number.

It is an amenable number.

213444203213 is a deficient number, since it is larger than the sum of its proper divisors (5768762287).

213444203213 is an equidigital number, since it uses as much as digits as its factorization.

213444203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768762286.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 213444203213 its reverse (312302444312), we get a palindrome (525746647525).

The spelling of 213444203213 in words is "two hundred thirteen billion, four hundred forty-four million, two hundred three thousand, two hundred thirteen".