2021312122171 has 2 divisors, whose sum is σ = 2021312122172. Its totient is φ = 2021312122170.

The previous prime is 2021312122163. The next prime is 2021312122201. The reversal of 2021312122171 is 1712212131202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021312122171 - 2³ = 2021312122163 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021312122121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010656061085 + 1010656061086.

It is an arithmetic number, because the mean of its divisors is an integer number (1010656061086).

Almost surely, 2^{2021312122171} is an apocalyptic number.

2021312122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021312122171 is an equidigital number, since it uses as much as digits as its factorization.

2021312122171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 2021312122171 its reverse (1712212131202), we get a palindrome (3733524253373).

The spelling of 2021312122171 in words is "two trillion, twenty-one billion, three hundred twelve million, one hundred twenty-two thousand, one hundred seventy-one".