221255224 has 8 divisors (see below), whose sum is σ = 414853560. Its totient is φ = 110627608.

The previous prime is 221255219. The next prime is 221255249. The reversal of 221255224 is 422552122.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13828444 + ... + 13828459.

It is an arithmetic number, because the mean of its divisors is an integer number (51856695).

Almost surely, 2^221255224 is an apocalyptic number.

It is an amenable number.

221255224 is a deficient number, since it is larger than the sum of its proper divisors (193598336).

221255224 is a wasteful number, since it uses less digits than its factorization.

221255224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27656909 (or 27656905 counting only the distinct ones).

The product of its digits is 3200, while the sum is 25.

The square root of 221255224 is about 14874.6503824460. The cubic root of 221255224 is about 604.8270106238.

The spelling of 221255224 in words is "two hundred twenty-one million, two hundred fifty-five thousand, two hundred twenty-four".