221789946 has 16 divisors (see below), whose sum is σ = 506948544. Its totient is φ = 63368544.

The previous prime is 221789917. The next prime is 221789963. The reversal of 221789946 is 649987122.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221789895 and 221789904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2640315 + ... + 2640398.

It is an arithmetic number, because the mean of its divisors is an integer number (31684284).

Almost surely, 2^221789946 is an apocalyptic number.

221789946 is an abundant number, since it is smaller than the sum of its proper divisors (285158598).

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

221789946 is a wasteful number, since it uses less digits than its factorization.

221789946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280725.

The product of its digits is 435456, while the sum is 48.

The square root of 221789946 is about 14892.6138068507. The cubic root of 221789946 is about 605.3138603251.

The spelling of 221789946 in words is "two hundred twenty-one million, seven hundred eighty-nine thousand, nine hundred forty-six".