221856244 has 12 divisors (see below), whose sum is σ = 389632068. Its totient is φ = 110532800.

The previous prime is 221856227. The next prime is 221856247. The reversal of 221856244 is 442658122.

221856244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 167391844 + 54464400 = 12938^2 + 7380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221856247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97567 + ... + 99814.

It is an arithmetic number, because the mean of its divisors is an integer number (32469339).

Almost surely, 2^221856244 is an apocalyptic number.

It is an amenable number.

221856244 is a deficient number, since it is larger than the sum of its proper divisors (167775824).

221856244 is a wasteful number, since it uses less digits than its factorization.

221856244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197666 (or 197664 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 221856244 is about 14894.8395090380. The cubic root of 221856244 is about 605.3741682892.

The spelling of 221856244 in words is "two hundred twenty-one million, eight hundred fifty-six thousand, two hundred forty-four".