21012002222171 has 2 divisors, whose sum is σ = 21012002222172. Its totient is φ = 21012002222170.

The previous prime is 21012002222117. The next prime is 21012002222191. The reversal of 21012002222171 is 17122220021012.

Together with previous prime (21012002222117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012002222171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012002222111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506001111085 + 10506001111086.

It is an arithmetic number, because the mean of its divisors is an integer number (10506001111086).

Almost surely, 2^{21012002222171} is an apocalyptic number.

21012002222171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012002222171 is an equidigital number, since it uses as much as digits as its factorization.

21012002222171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21012002222171 its reverse (17122220021012), we get a palindrome (38134222243183).

The spelling of 21012002222171 in words is "twenty-one trillion, twelve billion, two million, two hundred twenty-two thousand, one hundred seventy-one".