221590 has 8 divisors (see below), whose sum is σ = 398880. Its totient is φ = 88632.

The previous prime is 221587. The next prime is 221603. The reversal of 221590 is 95122.

221590 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 an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11070 + ... + 11089.

It is an arithmetic number, because the mean of its divisors is an integer number (49860).

2²²¹⁵⁹⁰ is an apocalyptic number.

221590 is a deficient number, since it is larger than the sum of its proper divisors (177290).

221590 is a wasteful number, since it uses less digits than its factorization.

221590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22166.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 221590 is about 470.7334702355. The cubic root of 221590 is about 60.5131906671.

It can be divided in two parts, 22 and 1590, that multiplied together give a triangular number (34980 = T₂₆₄).

The spelling of 221590 in words is "two hundred twenty-one thousand, five hundred ninety".