12421931 has 4 divisors (see below), whose sum is σ = 12431664. Its totient is φ = 12412200.

The previous prime is 12421921. The next prime is 12421933. The reversal of 12421931 is 13912421.

12421931 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12421931 is a prime.

It is a super-2 number, since 2×12421931² = 308608739537522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12421897 and 12421906.

It is not an unprimeable number, because it can be changed into a prime (12421933) 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, 2600 + ... + 5621.

It is an arithmetic number, because the mean of its divisors is an integer number (3107916).

Almost surely, 2^12421931 is an apocalyptic number.

12421931 is a deficient number, since it is larger than the sum of its proper divisors (9733).

12421931 is an equidigital number, since it uses as much as digits as its factorization.

12421931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9732.

The product of its digits is 432, while the sum is 23.

The square root of 12421931 is about 3524.4759894203. The cubic root of 12421931 is about 231.5952800654.

The spelling of 12421931 in words is "twelve million, four hundred twenty-one thousand, nine hundred thirty-one".