2123571 has 4 divisors (see below), whose sum is σ = 2831432. Its totient is φ = 1415712.

The previous prime is 2123557. The next prime is 2123581. The reversal of 2123571 is 1753212.

2123571 is nontrivially palindromic in base 9.

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

It is a de Polignac number, because none of the positive numbers 2^k-2123571 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 (2123581) 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, 353926 + ... + 353931.

It is an arithmetic number, because the mean of its divisors is an integer number (707858).

2^2123571 is an apocalyptic number.

2123571 is a deficient number, since it is larger than the sum of its proper divisors (707861).

2123571 is an equidigital number, since it uses as much as digits as its factorization.

2123571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707860.

The product of its digits is 420, while the sum is 21.

The square root of 2123571 is about 1457.2477483256. The cubic root of 2123571 is about 128.5352545499.

Adding to 2123571 its reverse (1753212), we get a palindrome (3876783).

The spelling of 2123571 in words is "two million, one hundred twenty-three thousand, five hundred seventy-one".