121110112021 has 4 divisors (see below), whose sum is σ = 121779228844. Its totient is φ = 120440995200.

The previous prime is 121110112003. The next prime is 121110112043. The reversal of 121110112021 is 120211011121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4193987121 + 116916124900 = 64761^2 + 341930^2 .

It is a cyclic number.

It is not a de Polignac number, because 121110112021 - 2²¹ = 121108014869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121110111992 and 121110112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110110021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334558140 + ... + 334558501.

It is an arithmetic number, because the mean of its divisors is an integer number (30444807211).

Almost surely, 2^121110112021 is an apocalyptic number.

It is an amenable number.

121110112021 is a deficient number, since it is larger than the sum of its proper divisors (669116823).

121110112021 is an equidigital number, since it uses as much as digits as its factorization.

121110112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669116822.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121110112021 its reverse (120211011121), we get a palindrome (241321123142).

The spelling of 121110112021 in words is "one hundred twenty-one billion, one hundred ten million, one hundred twelve thousand, twenty-one".