2123171 has 4 divisors (see below), whose sum is σ = 2180592. Its totient is φ = 2065752.

The previous prime is 2123167. The next prime is 2123203. The reversal of 2123171 is 1713212.

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

It is a cyclic number.

It is not a de Polignac number, because 2123171 - 2² = 2123167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28655 + ... + 28728.

It is an arithmetic number, because the mean of its divisors is an integer number (545148).

2^2123171 is an apocalyptic number.

2123171 is a deficient number, since it is larger than the sum of its proper divisors (57421).

2123171 is an equidigital number, since it uses as much as digits as its factorization.

2123171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57420.

The product of its digits is 84, while the sum is 17.

The square root of 2123171 is about 1457.1104968395. The cubic root of 2123171 is about 128.5271836589.

Adding to 2123171 its reverse (1713212), we get a palindrome (3836383).

It can be divided in two parts, 21 and 23171, that multiplied together give a triangular number (486591 = T₉₈₆).

The spelling of 2123171 in words is "two million, one hundred twenty-three thousand, one hundred seventy-one".