12454921 has 4 divisors (see below), whose sum is σ = 12472132. Its totient is φ = 12437712.

The previous prime is 12454913. The next prime is 12454943. The reversal of 12454921 is 12945421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12945421 = 1481 ⋅8741.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 2595321 = 3140^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 12454921 - 2³ = 12454913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12454921.

It is not an unprimeable number, because it can be changed into a prime (12454951) 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, 7470 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (3118033).

Almost surely, 2^12454921 is an apocalyptic number.

It is an amenable number.

12454921 is a deficient number, since it is larger than the sum of its proper divisors (17211).

12454921 is an equidigital number, since it uses as much as digits as its factorization.

12454921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17210.

The product of its digits is 2880, while the sum is 28.

The square root of 12454921 is about 3529.1530145348. The cubic root of 12454921 is about 231.8001213942.

The spelling of 12454921 in words is "twelve million, four hundred fifty-four thousand, nine hundred twenty-one".