221004433 has 8 divisors (see below), whose sum is σ = 238121576. Its totient is φ = 203904000.

The previous prime is 221004431. The next prime is 221004449. The reversal of 221004433 is 334400122.

It can be written as a sum of positive squares in 4 ways, for example, as 8340544 + 212663889 = 2888^2 + 14583^2 .

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 221004433 - 2¹ = 221004431 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 221004433.

It is not an unprimeable number, because it can be changed into a prime (221004431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43633 + ... + 48433.

It is an arithmetic number, because the mean of its divisors is an integer number (29765197).

Almost surely, 2^221004433 is an apocalyptic number.

It is an amenable number.

221004433 is a deficient number, since it is larger than the sum of its proper divisors (17117143).

221004433 is a wasteful number, since it uses less digits than its factorization.

221004433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8355.

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

The square root of 221004433 is about 14866.2178444956. The cubic root of 221004433 is about 604.5984020581.

Adding to 221004433 its reverse (334400122), we get a palindrome (555404555).

The spelling of 221004433 in words is "two hundred twenty-one million, four thousand, four hundred thirty-three".