213444443 has 4 divisors (see below), whose sum is σ = 213478920. Its totient is φ = 213409968.

The previous prime is 213444419. The next prime is 213444463. The reversal of 213444443 is 344444312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213444443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213444463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5105 + ... + 21282.

It is an arithmetic number, because the mean of its divisors is an integer number (53369730).

Almost surely, 2^213444443 is an apocalyptic number.

213444443 is a deficient number, since it is larger than the sum of its proper divisors (34477).

213444443 is an equidigital number, since it uses as much as digits as its factorization.

213444443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34476.

The product of its digits is 18432, while the sum is 29.

The square root of 213444443 is about 14609.7379511064. The cubic root of 213444443 is about 597.6243497426.

Adding to 213444443 its reverse (344444312), we get a palindrome (557888755).

The spelling of 213444443 in words is "two hundred thirteen million, four hundred forty-four thousand, four hundred forty-three".