221799090 has 32 divisors (see below), whose sum is σ = 546707520. Its totient is φ = 57547584.

The previous prime is 221799077. The next prime is 221799161. The reversal of 221799090 is 90997122.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 98800 + ... + 101019.

It is an arithmetic number, because the mean of its divisors is an integer number (17084610).

Almost surely, 2^221799090 is an apocalyptic number.

221799090 is an abundant number, since it is smaller than the sum of its proper divisors (324908430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221799090 is a wasteful number, since it uses less digits than its factorization.

221799090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199866.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 221799090 is about 14892.9208015083. The cubic root of 221799090 is about 605.3221788775.

The spelling of 221799090 in words is "two hundred twenty-one million, seven hundred ninety-nine thousand, ninety".