2003404330421 has 4 divisors (see below), whose sum is σ = 2157512355852. Its totient is φ = 1849296304992.

The previous prime is 2003404330409. The next prime is 2003404330423. The reversal of 2003404330421 is 1240334043002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 249289505521 + 1754114824900 = 499289^2 + 1324430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2003404330421 - 2⁶ = 2003404330357 is a prime.

It is a super-2 number, since 2×2003404330421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2003404330423) 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, 77054012696 + ... + 77054012721.

It is an arithmetic number, because the mean of its divisors is an integer number (539378088963).

Almost surely, 2^{2003404330421} is an apocalyptic number.

It is an amenable number.

2003404330421 is a deficient number, since it is larger than the sum of its proper divisors (154108025431).

2003404330421 is a wasteful number, since it uses less digits than its factorization.

2003404330421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154108025430.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 2003404330421 its reverse (1240334043002), we get a palindrome (3243738373423).

The spelling of 2003404330421 in words is "two trillion, three billion, four hundred four million, three hundred thirty thousand, four hundred twenty-one".