21222021022171 has 2 divisors, whose sum is σ = 21222021022172. Its totient is φ = 21222021022170.

The previous prime is 21222021022087. The next prime is 21222021022183. The reversal of 21222021022171 is 17122012022212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222021022171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222021022271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010511085 + 10611010511086.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010511086).

Almost surely, 2^{21222021022171} is an apocalyptic number.

21222021022171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222021022171 is an equidigital number, since it uses as much as digits as its factorization.

21222021022171 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 21222021022171 its reverse (17122012022212), we get a palindrome (38344033044383).

The spelling of 21222021022171 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, twenty-two thousand, one hundred seventy-one".