221089487 has 4 divisors (see below), whose sum is σ = 221477256. Its totient is φ = 220701720.

The previous prime is 221089483. The next prime is 221089493. The reversal of 221089487 is 784980122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784980122 = 2 ⋅392490061.

It is a cyclic number.

It is not a de Polignac number, because 221089487 - 2² = 221089483 is a prime.

It is a super-2 number, since 2×221089487² = 97761122523846338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221089483) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 193028 + ... + 194169.

It is an arithmetic number, because the mean of its divisors is an integer number (55369314).

Almost surely, 2^221089487 is an apocalyptic number.

221089487 is a deficient number, since it is larger than the sum of its proper divisors (387769).

221089487 is an equidigital number, since it uses as much as digits as its factorization.

221089487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387768.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 221089487 is about 14869.0782162177. The cubic root of 221089487 is about 604.6759524136.

The spelling of 221089487 in words is "two hundred twenty-one million, eighty-nine thousand, four hundred eighty-seven".