220111221121 has 12 divisors (see below), whose sum is σ = 244335896532. Its totient is φ = 198119900000.

The previous prime is 220111221107. The next prime is 220111221167. The reversal of 220111221121 is 121122111022.

It can be written as a sum of positive squares in 2 ways, for example, as 91832635521 + 128278585600 = 303039^2 + 358160^2 .

It is not a de Polignac number, because 220111221121 - 2⁵ = 220111221089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220111221095 and 220111221104.

It is not an unprimeable number, because it can be changed into a prime (220111281121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8993230 + ... + 9017671.

It is an arithmetic number, because the mean of its divisors is an integer number (20361324711).

Almost surely, 2^220111221121 is an apocalyptic number.

It is an amenable number.

220111221121 is a deficient number, since it is larger than the sum of its proper divisors (24224675411).

220111221121 is a wasteful number, since it uses less digits than its factorization.

220111221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18011024 (or 18011013 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 220111221121 its reverse (121122111022), we get a palindrome (341233332143).

The spelling of 220111221121 in words is "two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".