221120221 has 4 divisors (see below), whose sum is σ = 252708832. Its totient is φ = 189531612.

The previous prime is 221120219. The next prime is 221120231. The reversal of 221120221 is 122021122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221120221 - 2¹ = 221120219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15794295 + ... + 15794308.

It is an arithmetic number, because the mean of its divisors is an integer number (63177208).

Almost surely, 2^221120221 is an apocalyptic number.

It is an amenable number.

221120221 is a deficient number, since it is larger than the sum of its proper divisors (31588611).

221120221 is an equidigital number, since it uses as much as digits as its factorization.

221120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31588610.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221120221 is about 14870.1116673682. Note that the first 3 decimals coincide. The cubic root of 221120221 is about 604.7039701029.

Adding to 221120221 its reverse (122021122), we get a palindrome (343141343).

Subtracting from 221120221 its reverse (122021122), we obtain a palindrome (99099099).

The spelling of 221120221 in words is "two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".