2121021202121 has 8 divisors (see below), whose sum is σ = 2136911179200. Its totient is φ = 2105140237200.

The previous prime is 2121021202063. The next prime is 2121021202177. The reversal of 2121021202121 is 1212021201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121021202121 - 2⁶ = 2121021202057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121021202121.

It is not an unprimeable number, because it can be changed into a prime (2121021202621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1780205 + ... + 2722346.

It is an arithmetic number, because the mean of its divisors is an integer number (267113897400).

Almost surely, 2^{2121021202121} is an apocalyptic number.

It is an amenable number.

2121021202121 is a deficient number, since it is larger than the sum of its proper divisors (15889977079).

2121021202121 is a wasteful number, since it uses less digits than its factorization.

2121021202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506079.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2121021202121 its reverse (1212021201212), we get a palindrome (3333042403333).

Subtracting from 2121021202121 its reverse (1212021201212), we obtain a palindrome (909000000909).

The spelling of 2121021202121 in words is "two trillion, one hundred twenty-one billion, twenty-one million, two hundred two thousand, one hundred twenty-one".