21222222222211 has 16 divisors (see below), whose sum is σ = 21819947650560. Its totient is φ = 20632902776640.

The previous prime is 21222222222199. The next prime is 21222222222217. The reversal of 21222222222211 is 11222222222212.

It is a cyclic number.

It is not a de Polignac number, because 21222222222211 - 2¹¹ = 21222222220163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222222222217) 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, 28023996 + ... + 28771318.

It is an arithmetic number, because the mean of its divisors is an integer number (1363746728160).

Almost surely, 2^{21222222222211} is an apocalyptic number.

21222222222211 is a deficient number, since it is larger than the sum of its proper divisors (597725428349).

21222222222211 is an equidigital number, since it uses as much as digits as its factorization.

21222222222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752946.

The product of its digits is 2048, while the sum is 25.

Adding to 21222222222211 its reverse (11222222222212), we get a palindrome (32444444444423).

Subtracting from 21222222222211 its reverse (11222222222212), we obtain a palindrome (9999999999999).

The spelling of 21222222222211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".