21202101120121 has 4 divisors (see below), whose sum is σ = 21203020455552. Its totient is φ = 21201181784692.

The previous prime is 21202101120113. The next prime is 21202101120209. The reversal of 21202101120121 is 12102110120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21202101120121 - 2³ = 21202101120113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202101120095 and 21202101120104.

It is not an unprimeable number, because it can be changed into a prime (21202101100121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459633121 + ... + 459679246.

It is an arithmetic number, because the mean of its divisors is an integer number (5300755113888).

Almost surely, 2^{21202101120121} is an apocalyptic number.

It is an amenable number.

21202101120121 is a deficient number, since it is larger than the sum of its proper divisors (919335431).

21202101120121 is an equidigital number, since it uses as much as digits as its factorization.

21202101120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919335430.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21202101120121 its reverse (12102110120212), we get a palindrome (33304211240333).

Subtracting from 21202101120121 its reverse (12102110120212), we obtain a palindrome (9099990999909).

The spelling of 21202101120121 in words is "twenty-one trillion, two hundred two billion, one hundred one million, one hundred twenty thousand, one hundred twenty-one".