220111121 has 8 divisors (see below), whose sum is σ = 233636040. Its totient is φ = 206650368.

The previous prime is 220111097. The next prime is 220111153. The reversal of 220111121 is 121111022.

It can be written as a sum of positive squares in 4 ways, for example, as 108576400 + 111534721 = 10420^2 + 10561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220111121 - 2⁶ = 220111057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220111321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8876 + ... + 22781.

It is an arithmetic number, because the mean of its divisors is an integer number (29204505).

Almost surely, 2^220111121 is an apocalyptic number.

It is an amenable number.

220111121 is a deficient number, since it is larger than the sum of its proper divisors (13524919).

220111121 is a wasteful number, since it uses less digits than its factorization.

220111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32083.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 220111121 is about 14836.1423894488. The cubic root of 220111121 is about 603.7826954276.

Adding to 220111121 its reverse (121111022), we get a palindrome (341222143).

Subtracting from 220111121 its reverse (121111022), we obtain a palindrome (99000099).

It can be divided in two parts, 22011 and 1121, that added together give a palindrome (23132).

The spelling of 220111121 in words is "two hundred twenty million, one hundred eleven thousand, one hundred twenty-one".