221455544 has 16 divisors (see below), whose sum is σ = 415626120. Its totient is φ = 110621920.

The previous prime is 221455541. The next prime is 221455561. The reversal of 221455544 is 445554122.

It is a self number, because there is not a number n which added to its sum of digits gives 221455544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221455541) 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, 3959 + ... + 21414.

Almost surely, 2^221455544 is an apocalyptic number.

It is an amenable number.

221455544 is a deficient number, since it is larger than the sum of its proper divisors (194170576).

221455544 is a wasteful number, since it uses less digits than its factorization.

221455544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470 (or 26466 counting only the distinct ones).

The product of its digits is 32000, while the sum is 32.

The square root of 221455544 is about 14881.3824626612. The cubic root of 221455544 is about 605.0094882741.

The spelling of 221455544 in words is "two hundred twenty-one million, four hundred fifty-five thousand, five hundred forty-four".