221854228 has 48 divisors (see below), whose sum is σ = 422682624. Its totient is φ = 101581920.

The previous prime is 221854223. The next prime is 221854231. The reversal of 221854228 is 822458122.

It is a junction number, because it is equal to n+sod(n) for n = 221854193 and 221854202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221854223) 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 15 ways as a sum of consecutive naturals, for example, 304801 + ... + 305527.

It is an arithmetic number, because the mean of its divisors is an integer number (8805888).

Almost surely, 2^221854228 is an apocalyptic number.

It is an amenable number.

221854228 is a deficient number, since it is larger than the sum of its proper divisors (200828396).

221854228 is a wasteful number, since it uses less digits than its factorization.

221854228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 890 counting only the distinct ones).

The product of its digits is 20480, while the sum is 34.

The square root of 221854228 is about 14894.7718344391. The cubic root of 221854228 is about 605.3723346123.

The spelling of 221854228 in words is "two hundred twenty-one million, eight hundred fifty-four thousand, two hundred twenty-eight".