2021100111001 has 16 divisors (see below), whose sum is σ = 2048989219200. Its totient is φ = 1993298409088.

The previous prime is 2021100110993. The next prime is 2021100111047. The reversal of 2021100111001 is 1001110011202.

It is a cyclic number.

It is not a de Polignac number, because 2021100111001 - 2³ = 2021100110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021100111061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120087855 + ... + 120104683.

It is an arithmetic number, because the mean of its divisors is an integer number (128061826200).

Almost surely, 2^{2021100111001} is an apocalyptic number.

It is an amenable number.

2021100111001 is a deficient number, since it is larger than the sum of its proper divisors (27889108199).

2021100111001 is a wasteful number, since it uses less digits than its factorization.

2021100111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19328.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 2021100111001 its reverse (1001110011202), we get a palindrome (3022210122203).

The spelling of 2021100111001 in words is "two trillion, twenty-one billion, one hundred million, one hundred eleven thousand, one".