213331313021 has 4 divisors (see below), whose sum is σ = 214564442172. Its totient is φ = 212098183872.

The previous prime is 213331312973. The next prime is 213331313081. The reversal of 213331313021 is 120313133312.

213331313021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 191331007396 + 22000305625 = 437414^2 + 148325^2 .

It is a cyclic number.

It is not a de Polignac number, because 213331313021 - 2¹⁰ = 213331311997 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 (213331313081) 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 3 ways as a sum of consecutive naturals, for example, 616564316 + ... + 616564661.

It is an arithmetic number, because the mean of its divisors is an integer number (53641110543).

Almost surely, 2^213331313021 is an apocalyptic number.

It is an amenable number.

213331313021 is a deficient number, since it is larger than the sum of its proper divisors (1233129151).

213331313021 is a wasteful number, since it uses less digits than its factorization.

213331313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233129150.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 213331313021 its reverse (120313133312), we get a palindrome (333644446333).

The spelling of 213331313021 in words is "two hundred thirteen billion, three hundred thirty-one million, three hundred thirteen thousand, twenty-one".