2121022121121 has 24 divisors (see below), whose sum is σ = 3131309877696. Its totient is φ = 1383146906400.

The previous prime is 2121022121117. The next prime is 2121022121201. The reversal of 2121022121121 is 1211212201212.

2121022121121 is a `hidden beast` number, since 2 + 1 + 210 + 221 + 211 + 21 = 666.

It is not a de Polignac number, because 2121022121121 - 2² = 2121022121117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121022121094 and 2121022121103.

It is not an unprimeable number, because it can be changed into a prime (2121022121111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13980925 + ... + 14131818.

It is an arithmetic number, because the mean of its divisors is an integer number (130471244904).

Almost surely, 2^{2121022121121} is an apocalyptic number.

It is an amenable number.

2121022121121 is a deficient number, since it is larger than the sum of its proper divisors (1010287756575).

2121022121121 is a wasteful number, since it uses less digits than its factorization.

2121022121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28112933 (or 28112930 counting only the distinct ones).

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

Adding to 2121022121121 its reverse (1211212201212), we get a palindrome (3332234322333).

The spelling of 2121022121121 in words is "two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".