12001213421 has 4 divisors (see below), whose sum is σ = 12011641344. Its totient is φ = 11990785500.

The previous prime is 12001213391. The next prime is 12001213453. The reversal of 12001213421 is 12431210021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12431210021 = 419 ⋅29668759.

It is a cyclic number.

It is not a de Polignac number, because 12001213421 - 2¹⁰ = 12001212397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12001213421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001213481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5212235 + ... + 5214536.

It is an arithmetic number, because the mean of its divisors is an integer number (3002910336).

Almost surely, 2^12001213421 is an apocalyptic number.

It is an amenable number.

12001213421 is a deficient number, since it is larger than the sum of its proper divisors (10427923).

12001213421 is a wasteful number, since it uses less digits than its factorization.

12001213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427922.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12001213421 its reverse (12431210021), we get a palindrome (24432423442).

The spelling of 12001213421 in words is "twelve billion, one million, two hundred thirteen thousand, four hundred twenty-one".