12003356421 has 48 divisors (see below), whose sum is σ = 20223889920. Its totient is φ = 6718390560.

The previous prime is 12003356401. The next prime is 12003356473. The reversal of 12003356421 is 12465330021.

12003356421 is a `hidden beast` number, since 1 + 200 + 3 + 35 + 6 + 421 = 666.

It is not a de Polignac number, because 12003356421 - 2⁷ = 12003356293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12003356401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1046206 + ... + 1057616.

It is an arithmetic number, because the mean of its divisors is an integer number (421331040).

Almost surely, 2^12003356421 is an apocalyptic number.

It is an amenable number.

12003356421 is a deficient number, since it is larger than the sum of its proper divisors (8220533499).

12003356421 is a wasteful number, since it uses less digits than its factorization.

12003356421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766 (or 11763 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 12003356421 its reverse (12465330021), we get a palindrome (24468686442).

The spelling of 12003356421 in words is "twelve billion, three million, three hundred fifty-six thousand, four hundred twenty-one".