12120121220121 has 16 divisors (see below), whose sum is σ = 18130062670720. Its totient is φ = 8001633425040.

The previous prime is 12120121220087. The next prime is 12120121220143. The reversal of 12120121220121 is 12102212102121.

12120121220121 is a `hidden beast` number, since 121 + 201 + 2 + 1 + 220 + 121 = 666.

It is not a de Polignac number, because 12120121220121 - 2¹⁰ = 12120121219097 is a prime.

It is a super-4 number, since 4×12120121220121⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120121220094 and 12120121220103.

It is not an unprimeable number, because it can be changed into a prime (12120121220161) 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, 2179091290 + ... + 2179096851.

It is an arithmetic number, because the mean of its divisors is an integer number (1133128916920).

Almost surely, 2^{12120121220121} is an apocalyptic number.

It is an amenable number.

12120121220121 is a deficient number, since it is larger than the sum of its proper divisors (6009941450599).

12120121220121 is a wasteful number, since it uses less digits than its factorization.

12120121220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358188253 (or 4358188247 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12120121220121 its reverse (12102212102121), we get a palindrome (24222333322242).

The spelling of 12120121220121 in words is "twelve trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".