221133561 has 32 divisors (see below), whose sum is σ = 327966720. Its totient is φ = 131414400.

The previous prime is 221133529. The next prime is 221133581. The reversal of 221133561 is 165331122.

It is not a de Polignac number, because 221133561 - 2⁵ = 221133529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221133581) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 706341 + ... + 706653.

It is an arithmetic number, because the mean of its divisors is an integer number (10248960).

Almost surely, 2^221133561 is an apocalyptic number.

It is an amenable number.

221133561 is a deficient number, since it is larger than the sum of its proper divisors (106833159).

221133561 is a wasteful number, since it uses less digits than its factorization.

221133561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677.

The product of its digits is 1080, while the sum is 24.

The square root of 221133561 is about 14870.5602113707. The cubic root of 221133561 is about 604.7161302885.

Adding to 221133561 its reverse (165331122), we get a palindrome (386464683).

The spelling of 221133561 in words is "two hundred twenty-one million, one hundred thirty-three thousand, five hundred sixty-one".