2121100200021 has 32 divisors (see below), whose sum is σ = 3306387621888. Its totient is φ = 1196390226240.

The previous prime is 2121100200019. The next prime is 2121100200031. The reversal of 2121100200021 is 1200020011212.

It is not a de Polignac number, because 2121100200021 - 2¹ = 2121100200019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121100200031) 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 31 ways as a sum of consecutive naturals, for example, 37736761 + ... + 37792926.

It is an arithmetic number, because the mean of its divisors is an integer number (103324613184).

Almost surely, 2^{2121100200021} is an apocalyptic number.

It is an amenable number.

2121100200021 is a deficient number, since it is larger than the sum of its proper divisors (1185287421867).

2121100200021 is a wasteful number, since it uses less digits than its factorization.

2121100200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75529761.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2121100200021 its reverse (1200020011212), we get a palindrome (3321120211233).

The spelling of 2121100200021 in words is "two trillion, one hundred twenty-one billion, one hundred million, two hundred thousand, twenty-one".