221581484 has 12 divisors (see below), whose sum is σ = 387956184. Its totient is φ = 110736864.

The previous prime is 221581483. The next prime is 221581511. The reversal of 221581484 is 484185122.

It is not an unprimeable number, because it can be changed into a prime (221581483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3377 + ... + 21320.

It is an arithmetic number, because the mean of its divisors is an integer number (32329682).

Almost surely, 2^221581484 is an apocalyptic number.

It is an amenable number.

221581484 is a deficient number, since it is larger than the sum of its proper divisors (166374700).

221581484 is a wasteful number, since it uses less digits than its factorization.

221581484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26944 (or 26942 counting only the distinct ones).

The product of its digits is 20480, while the sum is 35.

The square root of 221581484 is about 14885.6133229370. The cubic root of 221581484 is about 605.1241545623.

The spelling of 221581484 in words is "two hundred twenty-one million, five hundred eighty-one thousand, four hundred eighty-four".