2129871 has 4 divisors (see below), whose sum is σ = 2839832. Its totient is φ = 1419912.

The previous prime is 2129867. The next prime is 2129887. The reversal of 2129871 is 1789212.

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

It is not a de Polignac number, because 2129871 - 2² = 2129867 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129821) 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, 354976 + ... + 354981.

It is an arithmetic number, because the mean of its divisors is an integer number (709958).

2^2129871 is an apocalyptic number.

2129871 is a deficient number, since it is larger than the sum of its proper divisors (709961).

2129871 is an equidigital number, since it uses as much as digits as its factorization.

2129871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709960.

The product of its digits is 2016, while the sum is 30.

The square root of 2129871 is about 1459.4077565917. The cubic root of 2129871 is about 128.6622376108.

It can be divided in two parts, 21 and 29871, that added together give a palindrome (29892).

The spelling of 2129871 in words is "two million, one hundred twenty-nine thousand, eight hundred seventy-one".