221056736 has 24 divisors (see below), whose sum is σ = 438535944. Its totient is φ = 109682560.

The previous prime is 221056727. The next prime is 221056739. The reversal of 221056736 is 637650122.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221056739) 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, 22175 + ... + 30558.

It is an arithmetic number, because the mean of its divisors is an integer number (18272331).

Almost surely, 2^221056736 is an apocalyptic number.

It is an amenable number.

221056736 is a deficient number, since it is larger than the sum of its proper divisors (217479208).

221056736 is a wasteful number, since it uses less digits than its factorization.

221056736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52874 (or 52866 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 221056736 is about 14867.9768630436. The cubic root of 221056736 is about 604.6460931316.

The spelling of 221056736 in words is "two hundred twenty-one million, fifty-six thousand, seven hundred thirty-six".