221133564 has 30 divisors (see below), whose sum is σ = 578087664. Its totient is φ = 73711080.

The previous prime is 221133529. The next prime is 221133581. The reversal of 221133564 is 465331122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 340932 + ... + 341579.

Almost surely, 2^221133564 is an apocalyptic number.

It is an amenable number.

221133564 is an abundant number, since it is smaller than the sum of its proper divisors (356954100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221133564 is a wasteful number, since it uses less digits than its factorization.

221133564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682527 (or 682516 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 221133564 is about 14870.5603122411. The cubic root of 221133564 is about 604.7161330231.

Adding to 221133564 its reverse (465331122), we get a palindrome (686464686).

The spelling of 221133564 in words is "two hundred twenty-one million, one hundred thirty-three thousand, five hundred sixty-four".