2121110200021 has 16 divisors (see below), whose sum is σ = 2165898391488. Its totient is φ = 2076667488000.

The previous prime is 2121110200019. The next prime is 2121110200051. The reversal of 2121110200021 is 1200020111212.

It is a cyclic number.

It is not a de Polignac number, because 2121110200021 - 2¹ = 2121110200019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121110199974 and 2121110200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121110200051) 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, 11330446 + ... + 11516128.

It is an arithmetic number, because the mean of its divisors is an integer number (135368649468).

Almost surely, 2^{2121110200021} is an apocalyptic number.

It is an amenable number.

2121110200021 is a deficient number, since it is larger than the sum of its proper divisors (44788191467).

2121110200021 is a wasteful number, since it uses less digits than its factorization.

2121110200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186612.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121110200021 its reverse (1200020111212), we get a palindrome (3321130311233).

The spelling of 2121110200021 in words is "two trillion, one hundred twenty-one billion, one hundred ten million, two hundred thousand, twenty-one".