213105503 has 8 divisors (see below), whose sum is σ = 229614000. Its totient is φ = 196613568.

The previous prime is 213105499. The next prime is 213105517. The reversal of 213105503 is 305501312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213105503 - 2² = 213105499 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 (213105583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40403 + ... + 45371.

It is an arithmetic number, because the mean of its divisors is an integer number (28701750).

Almost surely, 2^213105503 is an apocalyptic number.

213105503 is a deficient number, since it is larger than the sum of its proper divisors (16508497).

213105503 is a wasteful number, since it uses less digits than its factorization.

213105503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8281.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 213105503 is about 14598.1335450803. The cubic root of 213105503 is about 597.3078487881.

Adding to 213105503 its reverse (305501312), we get a palindrome (518606815).

The spelling of 213105503 in words is "two hundred thirteen million, one hundred five thousand, five hundred three".