111001220121 has 16 divisors (see below), whose sum is σ = 161550109440. Its totient is φ = 67234387920.

The previous prime is 111001220087. The next prime is 111001220123. The reversal of 111001220121 is 121022100111.

It is not a de Polignac number, because 111001220121 - 2¹³ = 111001211929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111001220097 and 111001220106.

It is not an unprimeable number, because it can be changed into a prime (111001220123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919251 + ... + 1032968.

It is an arithmetic number, because the mean of its divisors is an integer number (10096881840).

Almost surely, 2^111001220121 is an apocalyptic number.

111001220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111001220121 is a deficient number, since it is larger than the sum of its proper divisors (50548889319).

111001220121 is a wasteful number, since it uses less digits than its factorization.

111001220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953956.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111001220121 its reverse (121022100111), we get a palindrome (232023320232).

The spelling of 111001220121 in words is "one hundred eleven billion, one million, two hundred twenty thousand, one hundred twenty-one".