21102110120121 has 8 divisors (see below), whose sum is σ = 28187584026144. Its totient is φ = 14042354813760.

The previous prime is 21102110120099. The next prime is 21102110120191. The reversal of 21102110120121 is 12102101120112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102110120121 - 2⁵ = 21102110120089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102110120121.

It is not an unprimeable number, because it can be changed into a prime (21102110120191) 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 7 ways as a sum of consecutive naturals, for example, 6429648000 + ... + 6429651281.

It is an arithmetic number, because the mean of its divisors is an integer number (3523448003268).

Almost surely, 2^{21102110120121} is an apocalyptic number.

It is an amenable number.

21102110120121 is a deficient number, since it is larger than the sum of its proper divisors (7085473906023).

21102110120121 is a wasteful number, since it uses less digits than its factorization.

21102110120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12859299831.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102110120121 its reverse (12102101120112), we get a palindrome (33204211240233).

Subtracting from 21102110120121 its reverse (12102101120112), we obtain a palindrome (9000009000009).

The spelling of 21102110120121 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, one hundred twenty thousand, one hundred twenty-one".