2021222212171 has 2 divisors, whose sum is σ = 2021222212172. Its totient is φ = 2021222212170.

The previous prime is 2021222212159. The next prime is 2021222212249. The reversal of 2021222212171 is 1712122221202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021222212171 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021222212871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010611106085 + 1010611106086.

It is an arithmetic number, because the mean of its divisors is an integer number (1010611106086).

Almost surely, 2^{2021222212171} is an apocalyptic number.

2021222212171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021222212171 is an equidigital number, since it uses as much as digits as its factorization.

2021222212171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 2021222212171 its reverse (1712122221202), we get a palindrome (3733344433373).

The spelling of 2021222212171 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred seventy-one".