2121021133221 has 16 divisors (see below), whose sum is σ = 3014213136768. Its totient is φ = 1322023296000.

The previous prime is 2121021133163. The next prime is 2121021133223. The reversal of 2121021133221 is 1223311201212.

It is not a de Polignac number, because 2121021133221 - 2⁶ = 2121021133157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121021133223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137703060 + ... + 137718461.

It is an arithmetic number, because the mean of its divisors is an integer number (188388321048).

Almost surely, 2^{2121021133221} is an apocalyptic number.

It is an amenable number.

2121021133221 is a deficient number, since it is larger than the sum of its proper divisors (893192003547).

2121021133221 is a wasteful number, since it uses less digits than its factorization.

2121021133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275421692.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2121021133221 its reverse (1223311201212), we get a palindrome (3344332334433).

The spelling of 2121021133221 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred thirty-three thousand, two hundred twenty-one".