12421240 has 32 divisors (see below), whose sum is σ = 30098880. Its totient is φ = 4586112.

The previous prime is 12421229. The next prime is 12421243. The reversal of 12421240 is 4212421.

12421240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11424 + ... + 12463.

It is an arithmetic number, because the mean of its divisors is an integer number (940590).

Almost surely, 2^12421240 is an apocalyptic number.

12421240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12421240 is an abundant number, since it is smaller than the sum of its proper divisors (17677640).

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

12421240 is a wasteful number, since it uses less digits than its factorization.

12421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23911 (or 23907 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12421240 is about 3524.3779593001. The cubic root of 12421240 is about 231.5909856363.

Adding to 12421240 its reverse (4212421), we get a palindrome (16633661).

The spelling of 12421240 in words is "twelve million, four hundred twenty-one thousand, two hundred forty".