2166921903271 has 2 divisors, whose sum is σ = 2166921903272. Its totient is φ = 2166921903270.

The previous prime is 2166921903269. The next prime is 2166921903281. The reversal of 2166921903271 is 1723091296612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166921903271 - 2¹ = 2166921903269 is a prime.

It is a super-2 number, since 2×2166921903271² (a number of 25 digits) contains 22 as substring.

Together with 2166921903269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166921903221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083460951635 + 1083460951636.

It is an arithmetic number, because the mean of its divisors is an integer number (1083460951636).

Almost surely, 2^{2166921903271} is an apocalyptic number.

2166921903271 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166921903271 is an equidigital number, since it uses as much as digits as its factorization.

2166921903271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 2166921903271 in words is "two trillion, one hundred sixty-six billion, nine hundred twenty-one million, nine hundred three thousand, two hundred seventy-one".