2133521 has 4 divisors (see below), whose sum is σ = 2297652. Its totient is φ = 1969392.

The previous prime is 2133487. The next prime is 2133533. The reversal of 2133521 is 1253312.

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 923521 + 1210000 = 961^2 + 1100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2133521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2133521.

It is not an unprimeable number, because it can be changed into a prime (2133541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82046 + ... + 82071.

It is an arithmetic number, because the mean of its divisors is an integer number (574413).

2^2133521 is an apocalyptic number.

It is an amenable number.

2133521 is a deficient number, since it is larger than the sum of its proper divisors (164131).

2133521 is a wasteful number, since it uses less digits than its factorization.

2133521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164130.

The product of its digits is 180, while the sum is 17.

The square root of 2133521 is about 1460.6577285593. The cubic root of 2133521 is about 128.7356926320.

Adding to 2133521 its reverse (1253312), we get a palindrome (3386833).

The spelling of 2133521 in words is "two million, one hundred thirty-three thousand, five hundred twenty-one".