221220433 has 8 divisors (see below), whose sum is σ = 260979200. Its totient is φ = 183500640.

The previous prime is 221220427. The next prime is 221220437. The reversal of 221220433 is 334022122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221220433 - 2¹⁷ = 221089361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221220433.

It is not an unprimeable number, because it can be changed into a prime (221220437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509508 + ... + 509941.

It is an arithmetic number, because the mean of its divisors is an integer number (32622400).

Almost surely, 2^221220433 is an apocalyptic number.

It is an amenable number.

221220433 is a deficient number, since it is larger than the sum of its proper divisors (39758767).

221220433 is a wasteful number, since it uses less digits than its factorization.

221220433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019487.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221220433 is about 14873.4808636042. The cubic root of 221220433 is about 604.7953072073.

Adding to 221220433 its reverse (334022122), we get a palindrome (555242555).

The spelling of 221220433 in words is "two hundred twenty-one million, two hundred twenty thousand, four hundred thirty-three".