221044460 has 48 divisors (see below), whose sum is σ = 571319616. Its totient is φ = 69956352.

The previous prime is 221044451. The next prime is 221044471. The reversal of 221044460 is 64440122.

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 15 ways as a sum of consecutive naturals, for example, 58907 + ... + 62546.

It is an arithmetic number, because the mean of its divisors is an integer number (11902492).

Almost surely, 2^221044460 is an apocalyptic number.

221044460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221044460 is an abundant number, since it is smaller than the sum of its proper divisors (350275156).

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

221044460 is a wasteful number, since it uses less digits than its factorization.

221044460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121482 (or 121480 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 221044460 is about 14867.5640237397. The cubic root of 221044460 is about 604.6349002692.

Adding to 221044460 its reverse (64440122), we get a palindrome (285484582).

The spelling of 221044460 in words is "two hundred twenty-one million, forty-four thousand, four hundred sixty".