12421424421 has 24 divisors (see below), whose sum is σ = 20635831424. Its totient is φ = 7052741280.

The previous prime is 12421424419. The next prime is 12421424437. The reversal of 12421424421 is 12442412421.

12421424421 is a `hidden beast` number, since 1 + 2 + 4 + 214 + 2 + 442 + 1 = 666.

It is not a de Polignac number, because 12421424421 - 2¹ = 12421424419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421424461) 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 23 ways as a sum of consecutive naturals, for example, 618025 + ... + 637806.

Almost surely, 2^12421424421 is an apocalyptic number.

It is an amenable number.

12421424421 is a deficient number, since it is larger than the sum of its proper divisors (8214407003).

12421424421 is a wasteful number, since it uses less digits than its factorization.

12421424421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256001 (or 1255998 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

Adding to 12421424421 its reverse (12442412421), we get a palindrome (24863836842).

The spelling of 12421424421 in words is "twelve billion, four hundred twenty-one million, four hundred twenty-four thousand, four hundred twenty-one".