21222121221227 has 2 divisors, whose sum is σ = 21222121221228. Its totient is φ = 21222121221226.

The previous prime is 21222121221199. The next prime is 21222121221277. The reversal of 21222121221227 is 72212212122212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222121221227 - 2¹² = 21222121217131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222121221227.

It is not a weakly prime, because it can be changed into another prime (21222121221277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060610613 + 10611060610614.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060610614).

Almost surely, 2^{21222121221227} is an apocalyptic number.

21222121221227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222121221227 is an equidigital number, since it uses as much as digits as its factorization.

21222121221227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 29.

Adding to 21222121221227 its reverse (72212212122212), we get a palindrome (93434333343439).

The spelling of 21222121221227 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-seven".