21112200002221 has 16 divisors (see below), whose sum is σ = 22045196371968. Its totient is φ = 20180464642800.

The previous prime is 21112200002207. The next prime is 21112200002261. The reversal of 21112200002221 is 12220000221112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21112200002221 - 2¹⁵ = 21112199969453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112200002195 and 21112200002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112200002261) 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, 205178416 + ... + 205281286.

It is an arithmetic number, because the mean of its divisors is an integer number (1377824773248).

Almost surely, 2^{21112200002221} is an apocalyptic number.

It is an amenable number.

21112200002221 is a deficient number, since it is larger than the sum of its proper divisors (932996369747).

21112200002221 is a wasteful number, since it uses less digits than its factorization.

21112200002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108912.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112200002221 its reverse (12220000221112), we get a palindrome (33332200223333).

The spelling of 21112200002221 in words is "twenty-one trillion, one hundred twelve billion, two hundred million, two thousand, two hundred twenty-one".