2013521 has 4 divisors (see below), whose sum is σ = 2017344. Its totient is φ = 2009700.

The previous prime is 2013511. The next prime is 2013533. The reversal of 2013521 is 1253102.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2013521 - 2⁶ = 2013457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2013496 and 2013505.

It is not an unprimeable number, because it can be changed into a prime (2013511) 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, 965 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (504336).

2^2013521 is an apocalyptic number.

It is an amenable number.

2013521 is a deficient number, since it is larger than the sum of its proper divisors (3823).

2013521 is an equidigital number, since it uses as much as digits as its factorization.

2013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2013521 is about 1418.9859054973. The cubic root of 2013521 is about 126.2753907694.

Adding to 2013521 its reverse (1253102), we get a palindrome (3266623).

The spelling of 2013521 in words is "two million, thirteen thousand, five hundred twenty-one".