213021313133 has 4 divisors (see below), whose sum is σ = 213278275740. Its totient is φ = 212764350528.

The previous prime is 213021313111. The next prime is 213021313139. The reversal of 213021313133 is 331313120312.

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 131552740804 + 81468572329 = 362702^2 + 285427^2 .

It is a cyclic number.

It is not a de Polignac number, because 213021313133 - 2²² = 213017118829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213021313099 and 213021313108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021313139) 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, 128480060 + ... + 128481717.

It is an arithmetic number, because the mean of its divisors is an integer number (53319568935).

Almost surely, 2^213021313133 is an apocalyptic number.

It is an amenable number.

213021313133 is a deficient number, since it is larger than the sum of its proper divisors (256962607).

213021313133 is an equidigital number, since it uses as much as digits as its factorization.

213021313133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256962606.

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

Adding to 213021313133 its reverse (331313120312), we get a palindrome (544334433445).

The spelling of 213021313133 in words is "two hundred thirteen billion, twenty-one million, three hundred thirteen thousand, one hundred thirty-three".