221330121 has 8 divisors (see below), whose sum is σ = 295192224. Its totient is φ = 147510720.

The previous prime is 221330119. The next prime is 221330129. The reversal of 221330121 is 121033122.

221330121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221330121 - 2¹ = 221330119 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221330121.

It is not an unprimeable number, because it can be changed into a prime (221330129) 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, 4506 + ... + 21516.

It is an arithmetic number, because the mean of its divisors is an integer number (36899028).

Almost surely, 2^221330121 is an apocalyptic number.

It is an amenable number.

221330121 is a deficient number, since it is larger than the sum of its proper divisors (73862103).

221330121 is a wasteful number, since it uses less digits than its factorization.

221330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21351.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221330121 is about 14877.1677748152. The cubic root of 221330121 is about 604.8952494918.

Adding to 221330121 its reverse (121033122), we get a palindrome (342363243).

The spelling of 221330121 in words is "two hundred twenty-one million, three hundred thirty thousand, one hundred twenty-one".