221133121 has 16 divisors (see below), whose sum is σ = 248832000. Its totient is φ = 194798800.

The previous prime is 221133103. The next prime is 221133139. The reversal of 221133121 is 121331122.

It is an interprime number because it is at equal distance from previous prime (221133103) and next prime (221133139).

It is a cyclic number.

It is not a de Polignac number, because 221133121 - 2⁵ = 221133089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221133095 and 221133104.

It is not an unprimeable number, because it can be changed into a prime (221133151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43680 + ... + 48478.

It is an arithmetic number, because the mean of its divisors is an integer number (15552000).

Almost surely, 2^221133121 is an apocalyptic number.

It is an amenable number.

221133121 is a deficient number, since it is larger than the sum of its proper divisors (27698879).

221133121 is a wasteful number, since it uses less digits than its factorization.

221133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940.

The product of its digits is 72, while the sum is 16.

The square root of 221133121 is about 14870.5454170316. The cubic root of 221133121 is about 604.7157292107.

Adding to 221133121 its reverse (121331122), we get a palindrome (342464243).

The spelling of 221133121 in words is "two hundred twenty-one million, one hundred thirty-three thousand, one hundred twenty-one".