21002221101211 has 16 divisors (see below), whose sum is σ = 24108743476224. Its totient is φ = 17922334888224.

The previous prime is 21002221101181. The next prime is 21002221101223. The reversal of 21002221101211 is 11210112220012.

It is a cyclic number.

It is not a de Polignac number, because 21002221101211 - 2⁵ = 21002221101179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002221111211) 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, 566751 + ... + 6505816.

It is an arithmetic number, because the mean of its divisors is an integer number (1506796467264).

Almost surely, 2^{21002221101211} is an apocalyptic number.

21002221101211 is a deficient number, since it is larger than the sum of its proper divisors (3106522375013).

21002221101211 is a wasteful number, since it uses less digits than its factorization.

21002221101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074450.

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

Adding to 21002221101211 its reverse (11210112220012), we get a palindrome (32212333321223).

The spelling of 21002221101211 in words is "twenty-one trillion, two billion, two hundred twenty-one million, one hundred one thousand, two hundred eleven".