21222111222211 has 2 divisors, whose sum is σ = 21222111222212. Its totient is φ = 21222111222210.

The previous prime is 21222111222187. The next prime is 21222111222217. The reversal of 21222111222211 is 11222211122212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222111222211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222111222217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611055611105 + 10611055611106.

It is an arithmetic number, because the mean of its divisors is an integer number (10611055611106).

Almost surely, 2^{21222111222211} is an apocalyptic number.

21222111222211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222111222211 is an equidigital number, since it uses as much as digits as its factorization.

21222111222211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 22.

Adding to 21222111222211 its reverse (11222211122212), we get a palindrome (32444322344423).

Subtracting from 21222111222211 its reverse (11222211122212), we obtain a palindrome (9999900099999).

The spelling of 21222111222211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".