221751364 has 12 divisors (see below), whose sum is σ = 395387244. Its totient is φ = 108783584.

The previous prime is 221751347. The next prime is 221751377. The reversal of 221751364 is 463157122.

It can be written as a sum of positive squares in 2 ways, for example, as 60715264 + 161036100 = 7792^2 + 12690^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522787 + ... + 523210.

It is an arithmetic number, because the mean of its divisors is an integer number (32948937).

Almost surely, 2^221751364 is an apocalyptic number.

It is an amenable number.

221751364 is a deficient number, since it is larger than the sum of its proper divisors (173635880).

221751364 is a wasteful number, since it uses less digits than its factorization.

221751364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046054 (or 1046052 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 221751364 is about 14891.3184104028. The cubic root of 221751364 is about 605.2787586833.

The spelling of 221751364 in words is "two hundred twenty-one million, seven hundred fifty-one thousand, three hundred sixty-four".