12400033421 has 4 divisors (see below), whose sum is σ = 12400256892. Its totient is φ = 12399809952.

The previous prime is 12400033391. The next prime is 12400033423. The reversal of 12400033421 is 12433000421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8369688196 + 4030345225 = 91486^2 + 63485^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400033421 - 2⁶ = 12400033357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12400033393 and 12400033402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400033423) 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 3 ways as a sum of consecutive naturals, for example, 42065 + ... + 163001.

It is an arithmetic number, because the mean of its divisors is an integer number (3100064223).

Almost surely, 2^12400033421 is an apocalyptic number.

It is an amenable number.

12400033421 is a deficient number, since it is larger than the sum of its proper divisors (223471).

12400033421 is a wasteful number, since it uses less digits than its factorization.

12400033421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223470.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 12400033421 its reverse (12433000421), we get a palindrome (24833033842).

The spelling of 12400033421 in words is "twelve billion, four hundred million, thirty-three thousand, four hundred twenty-one".