2003221523 has 4 divisors (see below), whose sum is σ = 2025729720. Its totient is φ = 1980713328.

The previous prime is 2003221481. The next prime is 2003221531. The reversal of 2003221523 is 3251223002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2003221523 - 2²⁰ = 2002172947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2003221495 and 2003221504.

It is not an unprimeable number, because it can be changed into a prime (2003221553) 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, 11253965 + ... + 11254142.

It is an arithmetic number, because the mean of its divisors is an integer number (506432430).

Almost surely, 2^2003221523 is an apocalyptic number.

2003221523 is a deficient number, since it is larger than the sum of its proper divisors (22508197).

2003221523 is an equidigital number, since it uses as much as digits as its factorization.

2003221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22508196.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 2003221523 is about 44757.3627797707. The cubic root of 2003221523 is about 1260.5971644450.

Adding to 2003221523 its reverse (3251223002), we get a palindrome (5254444525).

The spelling of 2003221523 in words is "two billion, three million, two hundred twenty-one thousand, five hundred twenty-three".