221064556 has 12 divisors (see below), whose sum is σ = 387419760. Its totient is φ = 110373200.

The previous prime is 221064553. The next prime is 221064577. The reversal of 221064556 is 655460122.

221064556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221064553) 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, 36616 + ... + 42223.

It is an arithmetic number, because the mean of its divisors is an integer number (32284980).

Almost surely, 2^221064556 is an apocalyptic number.

It is an amenable number.

221064556 is a deficient number, since it is larger than the sum of its proper divisors (166355204).

221064556 is a wasteful number, since it uses less digits than its factorization.

221064556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79544 (or 79542 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 221064556 is about 14868.2398420257. The cubic root of 221064556 is about 604.6532229402.

It can be divided in two parts, 22106 and 4556, that added together give a palindrome (26662).

The spelling of 221064556 in words is "two hundred twenty-one million, sixty-four thousand, five hundred fifty-six".