2171305 has 4 divisors (see below), whose sum is σ = 2605572. Its totient is φ = 1737040.

The previous prime is 2171293. The next prime is 2171311. The reversal of 2171305 is 5031712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1149184 + 1022121 = 1072^2 + 1011^2 .

It is not a de Polignac number, because 2171305 - 2¹³ = 2163113 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217126 + ... + 217135.

It is an arithmetic number, because the mean of its divisors is an integer number (651393).

2^2171305 is an apocalyptic number.

It is an amenable number.

2171305 is a deficient number, since it is larger than the sum of its proper divisors (434267).

2171305 is an equidigital number, since it uses as much as digits as its factorization.

2171305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434266.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 2171305 is about 1473.5348655529. The cubic root of 2171305 is about 129.4912065505.

The spelling of 2171305 in words is "two million, one hundred seventy-one thousand, three hundred five".