2159221 has 8 divisors (see below), whose sum is σ = 2303640. Its totient is φ = 2016768.

The previous prime is 2159207. The next prime is 2159231. The reversal of 2159221 is 1229512.

2159221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 790321 + 1368900 = 889^2 + 1170^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2159221 - 2⁷ = 2159093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2159192 and 2159201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159231) 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, 2265 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (287955).

2^2159221 is an apocalyptic number.

It is an amenable number.

2159221 is a deficient number, since it is larger than the sum of its proper divisors (144419).

2159221 is a wasteful number, since it uses less digits than its factorization.

2159221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its digits is 360, while the sum is 22.

The square root of 2159221 is about 1469.4288005889. The cubic root of 2159221 is about 129.2505396758.

The spelling of 2159221 in words is "two million, one hundred fifty-nine thousand, two hundred twenty-one".