221003121 has 8 divisors (see below), whose sum is σ = 295070400. Its totient is φ = 147135632.

The previous prime is 221003093. The next prime is 221003129. The reversal of 221003121 is 121300122.

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 221003121 - 2⁵ = 221003089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221003097 and 221003106.

It is not an unprimeable number, because it can be changed into a prime (221003129) 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, 47346 + ... + 51803.

It is an arithmetic number, because the mean of its divisors is an integer number (36883800).

Almost surely, 2^221003121 is an apocalyptic number.

It is an amenable number.

221003121 is a deficient number, since it is larger than the sum of its proper divisors (74067279).

221003121 is an equidigital number, since it uses as much as digits as its factorization.

221003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99895.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221003121 is about 14866.1737175374. The cubic root of 221003121 is about 604.5972056497.

Adding to 221003121 its reverse (121300122), we get a palindrome (342303243).

The spelling of 221003121 in words is "two hundred twenty-one million, three thousand, one hundred twenty-one".