221632985 has 16 divisors (see below), whose sum is σ = 308493696. Its totient is φ = 149707008.

The previous prime is 221632979. The next prime is 221632987. The reversal of 221632985 is 589236122.

It is a cyclic number.

It is not a de Polignac number, because 221632985 - 2⁸ = 221632729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221632987) 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 15 ways as a sum of consecutive naturals, for example, 44912 + ... + 49601.

It is an arithmetic number, because the mean of its divisors is an integer number (19280856).

Almost surely, 2^221632985 is an apocalyptic number.

It is an amenable number.

221632985 is a deficient number, since it is larger than the sum of its proper divisors (86860711).

221632985 is an equidigital number, since it uses as much as digits as its factorization.

221632985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94592.

The product of its digits is 51840, while the sum is 38.

The square root of 221632985 is about 14887.3431142027. The cubic root of 221632985 is about 605.1710328549.

The spelling of 221632985 in words is "two hundred twenty-one million, six hundred thirty-two thousand, nine hundred eighty-five".