220321121 has 4 divisors (see below), whose sum is σ = 225444912. Its totient is φ = 215197332.

The previous prime is 220321111. The next prime is 220321147. The reversal of 220321121 is 121123022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121123022 = 2 ⋅60561511.

It is a cyclic number.

It is not a de Polignac number, because 220321121 - 2¹⁸ = 220058977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220321096 and 220321105.

It is not an unprimeable number, because it can be changed into a prime (220321111) 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 3 ways as a sum of consecutive naturals, for example, 2561831 + ... + 2561916.

It is an arithmetic number, because the mean of its divisors is an integer number (56361228).

Almost surely, 2^220321121 is an apocalyptic number.

It is an amenable number.

220321121 is a deficient number, since it is larger than the sum of its proper divisors (5123791).

220321121 is an equidigital number, since it uses as much as digits as its factorization.

220321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123790.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 220321121 is about 14843.2180136249. The cubic root of 220321121 is about 603.9746500844.

Adding to 220321121 its reverse (121123022), we get a palindrome (341444143).

The spelling of 220321121 in words is "two hundred twenty million, three hundred twenty-one thousand, one hundred twenty-one".