12421278 has 24 divisors (see below), whose sum is σ = 27570816. Its totient is φ = 4039200.

The previous prime is 12421267. The next prime is 12421291. The reversal of 12421278 is 87212421.

It is a congruent number.

It is an unprimeable number.

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, 7678 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (1148784).

Almost surely, 2^12421278 is an apocalyptic number.

12421278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12421278 is an abundant number, since it is smaller than the sum of its proper divisors (15149538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12421278 is a wasteful number, since it uses less digits than its factorization.

12421278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16880 (or 16877 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12421278 is about 3524.3833503182. The cubic root of 12421278 is about 231.5912218030.

Adding to 12421278 its reverse (87212421), we get a palindrome (99633699).

The spelling of 12421278 in words is "twelve million, four hundred twenty-one thousand, two hundred seventy-eight".