220221210121 has 12 divisors (see below), whose sum is σ = 244457990532. Its totient is φ = 198218900000.

The previous prime is 220221210109. The next prime is 220221210197. The reversal of 220221210121 is 121012122022.

It is a happy number.

220221210121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 122352344521 + 97868865600 = 349789^2 + 312840^2 .

It is not a de Polignac number, because 220221210121 - 2¹¹ = 220221208073 is a prime.

It is a super-3 number, since 3×220221210121³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221210095 and 220221210104.

It is not an unprimeable number, because it can be changed into a prime (220221210421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8997730 + ... + 9022171.

It is an arithmetic number, because the mean of its divisors is an integer number (20371499211).

Almost surely, 2^220221210121 is an apocalyptic number.

It is an amenable number.

220221210121 is a deficient number, since it is larger than the sum of its proper divisors (24236780411).

220221210121 is a wasteful number, since it uses less digits than its factorization.

220221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18020024 (or 18020013 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220221210121 its reverse (121012122022), we get a palindrome (341233332143).

The spelling of 220221210121 in words is "two hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".