12404431221 has 16 divisors (see below), whose sum is σ = 20355990144. Its totient is φ = 6542996544.

The previous prime is 12404431211. The next prime is 12404431253. The reversal of 12404431221 is 12213440421.

It is not a de Polignac number, because 12404431221 - 2¹⁷ = 12404300149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12404431191 and 12404431200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12404431211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22718466 + ... + 22719011.

It is an arithmetic number, because the mean of its divisors is an integer number (1272249384).

Almost surely, 2^12404431221 is an apocalyptic number.

It is an amenable number.

12404431221 is a deficient number, since it is larger than the sum of its proper divisors (7951558923).

12404431221 is a wasteful number, since it uses less digits than its factorization.

12404431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45437500.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 12404431221 its reverse (12213440421), we get a palindrome (24617871642).

The spelling of 12404431221 in words is "twelve billion, four hundred four million, four hundred thirty-one thousand, two hundred twenty-one".