21220201112121 has 16 divisors (see below), whose sum is σ = 34295274525120. Its totient is φ = 12860727946560.

The previous prime is 21220201112057. The next prime is 21220201112129. The reversal of 21220201112121 is 12121110202212.

21220201112121 is a `hidden beast` number, since 21 + 220 + 201 + 11 + 212 + 1 = 666.

It is not a de Polignac number, because 21220201112121 - 2⁶ = 21220201112057 is a prime.

It is a super-2 number, since 2×21220201112121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21220201112094 and 21220201112103.

It is not an unprimeable number, because it can be changed into a prime (21220201112129) 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, 35724244000 + ... + 35724244593.

It is an arithmetic number, because the mean of its divisors is an integer number (2143454657820).

Almost surely, 2^{21220201112121} is an apocalyptic number.

It is an amenable number.

21220201112121 is a deficient number, since it is larger than the sum of its proper divisors (13075073412999).

21220201112121 is a wasteful number, since it uses less digits than its factorization.

21220201112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71448488613 (or 71448488607 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220201112121 its reverse (12121110202212), we get a palindrome (33341311314333).

Subtracting from 21220201112121 its reverse (12121110202212), we obtain a palindrome (9099090909909).

The spelling of 21220201112121 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, one hundred twelve thousand, one hundred twenty-one".