2002521 has 4 divisors (see below), whose sum is σ = 2670032. Its totient is φ = 1335012.

The previous prime is 2002471. The next prime is 2002523. The reversal of 2002521 is 1252002.

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 not a de Polignac number, because 2002521 - 2⁹ = 2002009 is a prime.

It is a D-number.

It is a Duffinian number.

2002521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2002497 and 2002506.

It is not an unprimeable number, because it can be changed into a prime (2002523) 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, 333751 + ... + 333756.

It is an arithmetic number, because the mean of its divisors is an integer number (667508).

2^2002521 is an apocalyptic number.

It is an amenable number.

2002521 is a deficient number, since it is larger than the sum of its proper divisors (667511).

2002521 is an equidigital number, since it uses as much as digits as its factorization.

2002521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667510.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 2002521 is about 1415.1045897742. The cubic root of 2002521 is about 126.0450204452.

Adding to 2002521 its reverse (1252002), we get a palindrome (3254523).

The spelling of 2002521 in words is "two million, two thousand, five hundred twenty-one".