2190221 has 12 divisors (see below), whose sum is σ = 2515296. Its totient is φ = 1902120.

The previous prime is 2190217. The next prime is 2190233. The reversal of 2190221 is 1220912.

2190221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2190221 - 2² = 2190217 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 2190221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190271) 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 11 ways as a sum of consecutive naturals, for example, 2390 + ... + 3176.

It is an arithmetic number, because the mean of its divisors is an integer number (209608).

2^2190221 is an apocalyptic number.

It is an amenable number.

2190221 is a deficient number, since it is larger than the sum of its proper divisors (325075).

2190221 is a wasteful number, since it uses less digits than its factorization.

2190221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2190221 is about 1479.9395257915. The cubic root of 2190221 is about 129.8661541550.

The spelling of 2190221 in words is "two million, one hundred ninety thousand, two hundred twenty-one".