221118001 has 4 divisors (see below), whose sum is σ = 238127092. Its totient is φ = 204108912.

The previous prime is 221117983. The next prime is 221118013. The reversal of 221118001 is 100811122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109181601 + 111936400 = 10449^2 + 10580^2 .

It is a cyclic number.

It is not a de Polignac number, because 221118001 - 2⁷ = 221117873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221118091) 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 3 ways as a sum of consecutive naturals, for example, 8504526 + ... + 8504551.

It is an arithmetic number, because the mean of its divisors is an integer number (59531773).

Almost surely, 2^221118001 is an apocalyptic number.

It is an amenable number.

221118001 is a deficient number, since it is larger than the sum of its proper divisors (17009091).

221118001 is a wasteful number, since it uses less digits than its factorization.

221118001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17009090.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 221118001 is about 14870.0370208013. The cubic root of 221118001 is about 604.7019463964.

Adding to 221118001 its reverse (100811122), we get a palindrome (321929123).

The spelling of 221118001 in words is "two hundred twenty-one million, one hundred eighteen thousand, one".