2003533521 has 32 divisors (see below), whose sum is σ = 3097035648. Its totient is φ = 1138621440.

The previous prime is 2003533517. The next prime is 2003533523. The reversal of 2003533521 is 1253353002.

It is a happy number.

It is not a de Polignac number, because 2003533521 - 2² = 2003533517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2003533491 and 2003533500.

It is not an unprimeable number, because it can be changed into a prime (2003533523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148951 + ... + 161843.

It is an arithmetic number, because the mean of its divisors is an integer number (96782364).

Almost surely, 2^2003533521 is an apocalyptic number.

It is an amenable number.

2003533521 is a deficient number, since it is larger than the sum of its proper divisors (1093502127).

2003533521 is a wasteful number, since it uses less digits than its factorization.

2003533521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13201.

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 2003533521 is about 44760.8480817779. The cubic root of 2003533521 is about 1260.6626062634.

Adding to 2003533521 its reverse (1253353002), we get a palindrome (3256886523).

The spelling of 2003533521 in words is "two billion, three million, five hundred thirty-three thousand, five hundred twenty-one".