221133534 has 32 divisors (see below), whose sum is σ = 461946240. Its totient is φ = 70499232.

The previous prime is 221133529. The next prime is 221133581. The reversal of 221133534 is 435331122.

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 15 ways as a sum of consecutive naturals, for example, 4657 + ... + 21539.

It is an arithmetic number, because the mean of its divisors is an integer number (14435820).

Almost surely, 2^221133534 is an apocalyptic number.

221133534 is an abundant number, since it is smaller than the sum of its proper divisors (240812706).

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

221133534 is a wasteful number, since it uses less digits than its factorization.

221133534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16984.

The product of its digits is 2160, while the sum is 24.

The square root of 221133534 is about 14870.5593035366. The cubic root of 221133534 is about 604.7161056769.

Adding to 221133534 its reverse (435331122), we get a palindrome (656464656).

The spelling of 221133534 in words is "two hundred twenty-one million, one hundred thirty-three thousand, five hundred thirty-four".