2003521521 has 16 divisors (see below), whose sum is σ = 2765448000. Its totient is φ = 1288703808.

The previous prime is 2003521511. The next prime is 2003521567. The reversal of 2003521521 is 1251253002.

It is not a de Polignac number, because 2003521521 - 2¹¹ = 2003519473 is a prime.

It is a super-2 number, since 2×2003521521² = 8028196970220306882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2003521501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127330 + ... + 142196.

It is an arithmetic number, because the mean of its divisors is an integer number (172840500).

Almost surely, 2^2003521521 is an apocalyptic number.

It is an amenable number.

2003521521 is a deficient number, since it is larger than the sum of its proper divisors (761926479).

2003521521 is a wasteful number, since it uses less digits than its factorization.

2003521521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16448.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2003521521 is about 44760.7140358596. The cubic root of 2003521521 is about 1260.6600893799.

Adding to 2003521521 its reverse (1251253002), we get a palindrome (3254774523).

The spelling of 2003521521 in words is "two billion, three million, five hundred twenty-one thousand, five hundred twenty-one".