12924421 has 4 divisors (see below), whose sum is σ = 13168332. Its totient is φ = 12680512.

The previous prime is 12924391. The next prime is 12924449. The reversal of 12924421 is 12442921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12442921 = 47 ⋅264743.

It can be written as a sum of positive squares in 2 ways, for example, as 8468100 + 4456321 = 2910^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12924421 - 2⁹ = 12923909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12924451) 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, 121876 + ... + 121981.

It is an arithmetic number, because the mean of its divisors is an integer number (3292083).

Almost surely, 2^12924421 is an apocalyptic number.

It is an amenable number.

12924421 is a deficient number, since it is larger than the sum of its proper divisors (243911).

12924421 is an equidigital number, since it uses as much as digits as its factorization.

12924421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243910.

The product of its digits is 1152, while the sum is 25.

The square root of 12924421 is about 3595.0550760732. The cubic root of 12924421 is about 234.6769122790.

The spelling of 12924421 in words is "twelve million, nine hundred twenty-four thousand, four hundred twenty-one".