21002212211171 has 2 divisors, whose sum is σ = 21002212211172. Its totient is φ = 21002212211170.

The previous prime is 21002212211111. The next prime is 21002212211213. The reversal of 21002212211171 is 17111221220012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002212211171 - 2²⁶ = 21002145102307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002212211111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501106105585 + 10501106105586.

It is an arithmetic number, because the mean of its divisors is an integer number (10501106105586).

Almost surely, 2^{21002212211171} is an apocalyptic number.

21002212211171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002212211171 is an equidigital number, since it uses as much as digits as its factorization.

21002212211171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 21002212211171 its reverse (17111221220012), we get a palindrome (38113433431183).

The spelling of 21002212211171 in words is "twenty-one trillion, two billion, two hundred twelve million, two hundred eleven thousand, one hundred seventy-one".