2153521 has 4 divisors (see below), whose sum is σ = 2156544. Its totient is φ = 2150500.

The previous prime is 2153519. The next prime is 2153531. The reversal of 2153521 is 1253512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2153521 - 2¹ = 2153519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153531) 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, 216 + ... + 2086.

It is an arithmetic number, because the mean of its divisors is an integer number (539136).

2^2153521 is an apocalyptic number.

It is an amenable number.

2153521 is a deficient number, since it is larger than the sum of its proper divisors (3023).

2153521 is a wasteful number, since it uses less digits than its factorization.

2153521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022.

The product of its digits is 300, while the sum is 19.

The square root of 2153521 is about 1467.4879897294. The cubic root of 2153521 is about 129.1367058270.

Subtracting from 2153521 its reverse (1253512), we obtain a palindrome (900009).

The spelling of 2153521 in words is "two million, one hundred fifty-three thousand, five hundred twenty-one".