12421303421 has 4 divisors (see below), whose sum is σ = 12421792032. Its totient is φ = 12420814812.

The previous prime is 12421303373. The next prime is 12421303439. The reversal of 12421303421 is 12430312421.

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.

It is a cyclic number.

It is not a de Polignac number, because 12421303421 - 2⁶ = 12421303357 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 (12421303441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203951 + ... + 257756.

It is an arithmetic number, because the mean of its divisors is an integer number (3105448008).

Almost surely, 2^12421303421 is an apocalyptic number.

It is an amenable number.

12421303421 is a deficient number, since it is larger than the sum of its proper divisors (488611).

12421303421 is an equidigital number, since it uses as much as digits as its factorization.

12421303421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488610.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 12421303421 its reverse (12430312421), we get a palindrome (24851615842).

The spelling of 12421303421 in words is "twelve billion, four hundred twenty-one million, three hundred three thousand, four hundred twenty-one".