221988634 has 16 divisors (see below), whose sum is σ = 383551488. Its totient is φ = 94388112.

The previous prime is 221988589. The next prime is 221988673. The reversal of 221988634 is 436889122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60649 + ... + 64204.

It is an arithmetic number, because the mean of its divisors is an integer number (23971968).

Almost surely, 2^221988634 is an apocalyptic number.

221988634 is a deficient number, since it is larger than the sum of its proper divisors (161562854).

221988634 is a wasteful number, since it uses less digits than its factorization.

221988634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124989.

The product of its digits is 165888, while the sum is 43.

The square root of 221988634 is about 14899.2830028831. The cubic root of 221988634 is about 605.4945608882.

The spelling of 221988634 in words is "two hundred twenty-one million, nine hundred eighty-eight thousand, six hundred thirty-four".