12004402521 has 16 divisors (see below), whose sum is σ = 17391779840. Its totient is φ = 7337154960.

The previous prime is 12004402513. The next prime is 12004402523. The reversal of 12004402521 is 12520440021.

It is not a de Polignac number, because 12004402521 - 2³ = 12004402513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12004402523) 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, 3395065 + ... + 3398598.

It is an arithmetic number, because the mean of its divisors is an integer number (1086986240).

Almost surely, 2^12004402521 is an apocalyptic number.

It is an amenable number.

12004402521 is a deficient number, since it is larger than the sum of its proper divisors (5387377319).

12004402521 is a wasteful number, since it uses less digits than its factorization.

12004402521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6793716.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 12004402521 its reverse (12520440021), we get a palindrome (24524842542).

The spelling of 12004402521 in words is "twelve billion, four million, four hundred two thousand, five hundred twenty-one".