213303044021 has 4 divisors (see below), whose sum is σ = 213304063500. Its totient is φ = 213302024544.

The previous prime is 213303043997. The next prime is 213303044077. The reversal of 213303044021 is 120440303312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148017172900 + 65285871121 = 384730^2 + 255511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213303044021 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 (213303014021) 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, 68696 + ... + 656753.

It is an arithmetic number, because the mean of its divisors is an integer number (53326015875).

Almost surely, 2^213303044021 is an apocalyptic number.

It is an amenable number.

213303044021 is a deficient number, since it is larger than the sum of its proper divisors (1019479).

213303044021 is an equidigital number, since it uses as much as digits as its factorization.

213303044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019478.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 213303044021 its reverse (120440303312), we get a palindrome (333743347333).

The spelling of 213303044021 in words is "two hundred thirteen billion, three hundred three million, forty-four thousand, twenty-one".