213330121 has 4 divisors (see below), whose sum is σ = 213621892. Its totient is φ = 213038352.

The previous prime is 213330109. The next prime is 213330149. The reversal of 213330121 is 121033312.

213330121 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 117505600 + 95824521 = 10840^2 + 9789^2 .

It is a cyclic number.

It is not a de Polignac number, because 213330121 - 2⁹ = 213329609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213330095 and 213330104.

It is not an unprimeable number, because it can be changed into a prime (213330521) 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, 144786 + ... + 146251.

It is an arithmetic number, because the mean of its divisors is an integer number (53405473).

Almost surely, 2^213330121 is an apocalyptic number.

It is an amenable number.

213330121 is a deficient number, since it is larger than the sum of its proper divisors (291771).

213330121 is an equidigital number, since it uses as much as digits as its factorization.

213330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291770.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213330121 is about 14605.8248996762. The cubic root of 213330121 is about 597.5176337414.

Adding to 213330121 its reverse (121033312), we get a palindrome (334363433).

The spelling of 213330121 in words is "two hundred thirteen million, three hundred thirty thousand, one hundred twenty-one".