12421331 has 12 divisors (see below), whose sum is σ = 13663512. Its totient is φ = 11284416.

The previous prime is 12421327. The next prime is 12421333. The reversal of 12421331 is 13312421.

It is not a de Polignac number, because 12421331 - 2² = 12421327 is a prime.

It is a super-2 number, since 2×12421331² = 308578927623122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10775 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (1138626).

Almost surely, 2^12421331 is an apocalyptic number.

12421331 is a deficient number, since it is larger than the sum of its proper divisors (1242181).

12421331 is a wasteful number, since it uses less digits than its factorization.

12421331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1177 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 12421331 is about 3524.3908693560. The cubic root of 12421331 is about 231.5915511926.

Adding to 12421331 its reverse (13312421), we get a palindrome (25733752).

The spelling of 12421331 in words is "twelve million, four hundred twenty-one thousand, three hundred thirty-one".