221002102171 has 2 divisors, whose sum is σ = 221002102172. Its totient is φ = 221002102170.

The previous prime is 221002102163. The next prime is 221002102253. The reversal of 221002102171 is 171201200122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221002102171 - 2³ = 221002102163 is a prime.

It is a super-2 number, since 2×221002102171² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221002105171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501051085 + 110501051086.

It is an arithmetic number, because the mean of its divisors is an integer number (110501051086).

Almost surely, 2^221002102171 is an apocalyptic number.

221002102171 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002102171 is an equidigital number, since it uses as much as digits as its factorization.

221002102171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 221002102171 its reverse (171201200122), we get a palindrome (392203302293).

The spelling of 221002102171 in words is "two hundred twenty-one billion, two million, one hundred two thousand, one hundred seventy-one".