2130221 has 4 divisors (see below), whose sum is σ = 2133600. Its totient is φ = 2126844.

The previous prime is 2130209. The next prime is 2130239. The reversal of 2130221 is 1220312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130221 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 (2130241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (533400).

2^2130221 is an apocalyptic number.

It is an amenable number.

2130221 is a deficient number, since it is larger than the sum of its proper divisors (3379).

2130221 is an equidigital number, since it uses as much as digits as its factorization.

2130221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2130221 is about 1459.5276633213. The cubic root of 2130221 is about 128.6692848791.

Adding to 2130221 its reverse (1220312), we get a palindrome (3350533).

Subtracting from 2130221 its reverse (1220312), we obtain a palindrome (909909).

The spelling of 2130221 in words is "two million, one hundred thirty thousand, two hundred twenty-one".