2145221 has 8 divisors (see below), whose sum is σ = 2360064. Its totient is φ = 1937520.

The previous prime is 2145197. The next prime is 2145239. The reversal of 2145221 is 1225412.

2145221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2145221 - 2¹⁴ = 2128837 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 2145221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145 + ... + 2366.

It is an arithmetic number, because the mean of its divisors is an integer number (295008).

2^2145221 is an apocalyptic number.

It is an amenable number.

2145221 is a deficient number, since it is larger than the sum of its proper divisors (214843).

2145221 is a wasteful number, since it uses less digits than its factorization.

2145221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571.

The product of its digits is 160, while the sum is 17.

The square root of 2145221 is about 1464.6572978004. The cubic root of 2145221 is about 128.9705880104.

The spelling of 2145221 in words is "two million, one hundred forty-five thousand, two hundred twenty-one".