12101212220121 has 48 divisors (see below), whose sum is σ = 18232190755584. Its totient is φ = 7727058104832.

The previous prime is 12101212220117. The next prime is 12101212220143. The reversal of 12101212220121 is 12102221210121.

12101212220121 is a `hidden beast` number, since 1 + 210 + 1 + 212 + 220 + 1 + 21 = 666.

It is not a de Polignac number, because 12101212220121 - 2² = 12101212220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101212220094 and 12101212220103.

It is not an unprimeable number, because it can be changed into a prime (12101212220101) 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 47 ways as a sum of consecutive naturals, for example, 32994081 + ... + 33358833.

It is an arithmetic number, because the mean of its divisors is an integer number (379837307408).

Almost surely, 2^{12101212220121} is an apocalyptic number.

It is an amenable number.

12101212220121 is a deficient number, since it is larger than the sum of its proper divisors (6130978535463).

12101212220121 is a wasteful number, since it uses less digits than its factorization.

12101212220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366350 (or 366347 counting only the distinct ones).

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

Adding to 12101212220121 its reverse (12102221210121), we get a palindrome (24203433430242).

The spelling of 12101212220121 in words is "twelve trillion, one hundred one billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".