111221220121121 has 64 divisors (see below), whose sum is σ = 126909937631232. Its totient is φ = 96585540480000.

The previous prime is 111221220121117. The next prime is 111221220121147. The reversal of 111221220121121 is 121121022122111.

It is a happy number.

It is not a de Polignac number, because 111221220121121 - 2² = 111221220121117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221220121093 and 111221220121102.

It is not an unprimeable number, because it can be changed into a prime (111221220121021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3529360061 + ... + 3529391573.

It is an arithmetic number, because the mean of its divisors is an integer number (1982967775488).

Almost surely, 2^{111221220121121} is an apocalyptic number.

111221220121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111221220121121 is a deficient number, since it is larger than the sum of its proper divisors (15688717510111).

111221220121121 is a wasteful number, since it uses less digits than its factorization.

111221220121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32334.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111221220121121 its reverse (121121022122111), we get a palindrome (232342242243232).

The spelling of 111221220121121 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".