21120110002221 has 64 divisors (see below), whose sum is σ = 30778483680000. Its totient is φ = 12831165849600.

The previous prime is 21120110002213. The next prime is 21120110002253. The reversal of 21120110002221 is 12220001102112.

It is not a de Polignac number, because 21120110002221 - 2³ = 21120110002213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120110002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110002261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2761155805 + ... + 2761163453.

It is an arithmetic number, because the mean of its divisors is an integer number (480913807500).

Almost surely, 2^{21120110002221} is an apocalyptic number.

It is an amenable number.

21120110002221 is a deficient number, since it is larger than the sum of its proper divisors (9658373677779).

21120110002221 is a wasteful number, since it uses less digits than its factorization.

21120110002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13694.

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

Adding to 21120110002221 its reverse (12220001102112), we get a palindrome (33340111104333).

The spelling of 21120110002221 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, two thousand, two hundred twenty-one".