1021200212171 has 2 divisors, whose sum is σ = 1021200212172. Its totient is φ = 1021200212170.

The previous prime is 1021200212117. The next prime is 1021200212203. The reversal of 1021200212171 is 1712120021201.

It is a happy number.

Together with previous prime (1021200212117) 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 not a de Polignac number, because 1021200212171 - 2⁶ = 1021200212107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021200212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600106085 + 510600106086.

It is an arithmetic number, because the mean of its divisors is an integer number (510600106086).

Almost surely, 2^{1021200212171} is an apocalyptic number.

1021200212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021200212171 is an equidigital number, since it uses as much as digits as its factorization.

1021200212171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1021200212171 its reverse (1712120021201), we get a palindrome (2733320233372).

The spelling of 1021200212171 in words is "one trillion, twenty-one billion, two hundred million, two hundred twelve thousand, one hundred seventy-one".