213331121 has 4 divisors (see below), whose sum is σ = 213360372. Its totient is φ = 213301872.

The previous prime is 213331109. The next prime is 213331169. The reversal of 213331121 is 121133312.

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 8526400 + 204804721 = 2920^2 + 14311^2 .

It is a cyclic number.

It is not a de Polignac number, because 213331121 - 2¹⁰ = 213330097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213331121.

It is not an unprimeable number, because it can be changed into a prime (213331621) 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, 6191 + ... + 21563.

It is an arithmetic number, because the mean of its divisors is an integer number (53340093).

Almost surely, 2^213331121 is an apocalyptic number.

It is an amenable number.

213331121 is a deficient number, since it is larger than the sum of its proper divisors (29251).

213331121 is a wasteful number, since it uses less digits than its factorization.

213331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29250.

The product of its digits is 108, while the sum is 17.

The square root of 213331121 is about 14605.8591325536. The cubic root of 213331121 is about 597.5185673753.

Adding to 213331121 its reverse (121133312), we get a palindrome (334464433).

The spelling of 213331121 in words is "two hundred thirteen million, three hundred thirty-one thousand, one hundred twenty-one".