12043221421 has 24 divisors (see below), whose sum is σ = 16087433760. Its totient is φ = 8890408800.

The previous prime is 12043221419. The next prime is 12043221451. The reversal of 12043221421 is 12412234021.

It is not a de Polignac number, because 12043221421 - 2¹ = 12043221419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12043221392 and 12043221401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12043221401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 577750 + ... + 598231.

It is an arithmetic number, because the mean of its divisors is an integer number (670309740).

Almost surely, 2^12043221421 is an apocalyptic number.

12043221421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12043221421 is a deficient number, since it is larger than the sum of its proper divisors (4044212339).

12043221421 is a wasteful number, since it uses less digits than its factorization.

12043221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176025 (or 1176018 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 12043221421 its reverse (12412234021), we get a palindrome (24455455442).

The spelling of 12043221421 in words is "twelve billion, forty-three million, two hundred twenty-one thousand, four hundred twenty-one".