21222102211 has 2 divisors, whose sum is σ = 21222102212. Its totient is φ = 21222102210.

The previous prime is 21222102169. The next prime is 21222102221. The reversal of 21222102211 is 11220122212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222102211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611051105 + 10611051106.

It is an arithmetic number, because the mean of its divisors is an integer number (10611051106).

Almost surely, 2^21222102211 is an apocalyptic number.

21222102211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222102211 is an equidigital number, since it uses as much as digits as its factorization.

21222102211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21222102211 its reverse (11220122212), we get a palindrome (32442224423).

The spelling of 21222102211 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, two hundred eleven".