21002112120201 has 32 divisors (see below), whose sum is σ = 28701381596160. Its totient is φ = 13656295756224.

The previous prime is 21002112120191. The next prime is 21002112120247. The reversal of 21002112120201 is 10202121120012.

It is not a de Polignac number, because 21002112120201 - 2⁵ = 21002112120169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002112120001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131860630 + ... + 132019808.

It is an arithmetic number, because the mean of its divisors is an integer number (896918174880).

Almost surely, 2^{21002112120201} is an apocalyptic number.

It is an amenable number.

21002112120201 is a deficient number, since it is larger than the sum of its proper divisors (7699269475959).

21002112120201 is a wasteful number, since it uses less digits than its factorization.

21002112120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165725.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002112120201 its reverse (10202121120012), we get a palindrome (31204233240213).

The spelling of 21002112120201 in words is "twenty-one trillion, two billion, one hundred twelve million, one hundred twenty thousand, two hundred one".