2171291871 has 16 divisors (see below), whose sum is σ = 3376160000. Its totient is φ = 1240737624.

The previous prime is 2171291849. The next prime is 2171291879. The reversal of 2171291871 is 1781921712.

2171291871 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2171291871 - 2⁷ = 2171291743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171291879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1054021 + ... + 1056078.

It is an arithmetic number, because the mean of its divisors is an integer number (211010000).

Almost surely, 2^2171291871 is an apocalyptic number.

2171291871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2171291871 is a deficient number, since it is larger than the sum of its proper divisors (1204868129).

2171291871 is an equidigital number, since it uses as much as digits as its factorization.

2171291871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110123 (or 2110109 counting only the distinct ones).

The product of its digits is 14112, while the sum is 39.

The square root of 2171291871 is about 46597.1229905882. The cubic root of 2171291871 is about 1294.9094555637.

The spelling of 2171291871 in words is "two billion, one hundred seventy-one million, two hundred ninety-one thousand, eight hundred seventy-one".