111220020121 has 12 divisors (see below), whose sum is σ = 129409053732. Its totient is φ = 95308852128.

The previous prime is 111220020089. The next prime is 111220020137. The reversal of 111220020121 is 121020022111.

It can be written as a sum of positive squares in 2 ways, for example, as 28287539721 + 82932480400 = 168189^2 + 287980^2 .

It is not a de Polignac number, because 111220020121 - 2⁵ = 111220020089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111220023121) 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, 58450 + ... + 475243.

It is an arithmetic number, because the mean of its divisors is an integer number (10784087811).

Almost surely, 2^111220020121 is an apocalyptic number.

It is an amenable number.

111220020121 is a deficient number, since it is larger than the sum of its proper divisors (18189033611).

111220020121 is an equidigital number, since it uses as much as digits as its factorization.

111220020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537960 (or 537953 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111220020121 its reverse (121020022111), we get a palindrome (232240042232).

The spelling of 111220020121 in words is "one hundred eleven billion, two hundred twenty million, twenty thousand, one hundred twenty-one".