21002211002221 has 8 divisors (see below), whose sum is σ = 21845195589888. Its totient is φ = 20169569784000.

The previous prime is 21002211002167. The next prime is 21002211002257. The reversal of 21002211002221 is 12220011220012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21002211002221 - 2⁷ = 21002211002093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002211002195 and 21002211002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002211002921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2585838220 + ... + 2585846341.

It is an arithmetic number, because the mean of its divisors is an integer number (2730649448736).

Almost surely, 2^{21002211002221} is an apocalyptic number.

It is an amenable number.

21002211002221 is a deficient number, since it is larger than the sum of its proper divisors (842984587667).

21002211002221 is a wasteful number, since it uses less digits than its factorization.

21002211002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171684723.

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

Adding to 21002211002221 its reverse (12220011220012), we get a palindrome (33222222222233).

The spelling of 21002211002221 in words is "twenty-one trillion, two billion, two hundred eleven million, two thousand, two hundred twenty-one".