221333133 has 16 divisors (see below), whose sum is σ = 348900480. Its totient is φ = 122114496.

The previous prime is 221333089. The next prime is 221333143. The reversal of 221333133 is 331333122.

It is not a de Polignac number, because 221333133 - 2⁶ = 221333069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221333143) 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 15 ways as a sum of consecutive naturals, for example, 181110 + ... + 182327.

It is an arithmetic number, because the mean of its divisors is an integer number (21806280).

Almost surely, 2^221333133 is an apocalyptic number.

It is an amenable number.

221333133 is a deficient number, since it is larger than the sum of its proper divisors (127567347).

221333133 is a wasteful number, since it uses less digits than its factorization.

221333133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363476.

The product of its digits is 972, while the sum is 21.

The square root of 221333133 is about 14877.2690034159. The cubic root of 221333133 is about 604.8979934115.

Adding to 221333133 its reverse (331333122), we get a palindrome (552666255).

The spelling of 221333133 in words is "two hundred twenty-one million, three hundred thirty-three thousand, one hundred thirty-three".