221725904 has 20 divisors (see below), whose sum is σ = 441205764. Its totient is φ = 107866368.

The previous prime is 221725901. The next prime is 221725943. The reversal of 221725904 is 409527122.

It can be written as a sum of positive squares in 2 ways, for example, as 189007504 + 32718400 = 13748^2 + 5720^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221725901) by changing a digit.

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, 186677 + ... + 187860.

Almost surely, 2^221725904 is an apocalyptic number.

It is an amenable number.

221725904 is a deficient number, since it is larger than the sum of its proper divisors (219479860).

221725904 is a wasteful number, since it uses less digits than its factorization.

221725904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374582 (or 374576 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 221725904 is about 14890.4635253574. The cubic root of 221725904 is about 605.2555931182.

The spelling of 221725904 in words is "two hundred twenty-one million, seven hundred twenty-five thousand, nine hundred four".