221090 has 8 divisors (see below), whose sum is σ = 397980. Its totient is φ = 88432.

The previous prime is 221087. The next prime is 221093. The reversal of 221090 is 90122.

221090 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221087) and next prime (221093).

It can be written as a sum of positive squares in 2 ways, for example, as 203401 + 17689 = 451^2 + 133^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221093) 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 3 ways as a sum of consecutive naturals, for example, 11045 + ... + 11064.

2²²¹⁰⁹⁰ is an apocalyptic number.

221090 is a deficient number, since it is larger than the sum of its proper divisors (176890).

221090 is a wasteful number, since it uses less digits than its factorization.

221090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22116.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221090 is about 470.2020842149. The cubic root of 221090 is about 60.4676420095.

The spelling of 221090 in words is "two hundred twenty-one thousand, ninety".