21222002221171 has 2 divisors, whose sum is σ = 21222002221172. Its totient is φ = 21222002221170.

The previous prime is 21222002221157. The next prime is 21222002221261. The reversal of 21222002221171 is 17112220022212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222002221171 - 2¹⁵ = 21222002188403 is a prime.

It is a super-2 number, since 2×21222002221171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21222002221571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611001110585 + 10611001110586.

It is an arithmetic number, because the mean of its divisors is an integer number (10611001110586).

Almost surely, 2^{21222002221171} is an apocalyptic number.

21222002221171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222002221171 is an equidigital number, since it uses as much as digits as its factorization.

21222002221171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 21222002221171 its reverse (17112220022212), we get a palindrome (38334222243383).

The spelling of 21222002221171 in words is "twenty-one trillion, two hundred twenty-two billion, two million, two hundred twenty-one thousand, one hundred seventy-one".