221840090 has 8 divisors (see below), whose sum is σ = 399312180. Its totient is φ = 88736032.

The previous prime is 221840071. The next prime is 221840107. The reversal of 221840090 is 90048122.

It can be written as a sum of positive squares in 2 ways, for example, as 217828081 + 4012009 = 14759^2 + 2003^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11091995 + ... + 11092014.

Almost surely, 2^221840090 is an apocalyptic number.

221840090 is a deficient number, since it is larger than the sum of its proper divisors (177472090).

221840090 is a wasteful number, since it uses less digits than its factorization.

221840090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22184016.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 221840090 is about 14894.2972308196. The cubic root of 221840090 is about 605.3594749131.

The spelling of 221840090 in words is "two hundred twenty-one million, eight hundred forty thousand, ninety".