12455421 has 24 divisors (see below), whose sum is σ = 18792672. Its totient is φ = 7272000.

The previous prime is 12455419. The next prime is 12455449.

12455421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12455421 - 2¹ = 12455419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12455391 and 12455400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12455411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123271 + ... + 123371.

It is an arithmetic number, because the mean of its divisors is an integer number (783028).

Almost surely, 2^12455421 is an apocalyptic number.

12455421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12455421 is a deficient number, since it is larger than the sum of its proper divisors (6337251).

12455421 is a wasteful number, since it uses less digits than its factorization.

12455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 152 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 12455421 is about 3529.2238523505. The cubic root of 12455421 is about 231.8032232073.

It can be divided in two parts, 1245 and 5421, that added together give a palindrome (6666).

The spelling of 12455421 in words is "twelve million, four hundred fifty-five thousand, four hundred twenty-one".