12121021101121 has 4 divisors (see below), whose sum is σ = 12173951324500. Its totient is φ = 12068090877744.

The previous prime is 12121021101083. The next prime is 12121021101169. The reversal of 12121021101121 is 12110112012121.

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 10224396348721 + 1896624752400 = 3197561^2 + 1377180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121021101121 - 2²⁹ = 12120484230209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121021101095 and 12121021101104.

It is not an unprimeable number, because it can be changed into a prime (12121021101181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26465111346 + ... + 26465111803.

It is an arithmetic number, because the mean of its divisors is an integer number (3043487831125).

Almost surely, 2^{12121021101121} is an apocalyptic number.

It is an amenable number.

12121021101121 is a deficient number, since it is larger than the sum of its proper divisors (52930223379).

12121021101121 is an equidigital number, since it uses as much as digits as its factorization.

12121021101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52930223378.

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

Adding to 12121021101121 its reverse (12110112012121), we get a palindrome (24231133113242).

The spelling of 12121021101121 in words is "twelve trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred twenty-one".