12427021 has 4 divisors (see below), whose sum is σ = 12506332. Its totient is φ = 12347712.

The previous prime is 12426991. The next prime is 12427027. The reversal of 12427021 is 12072421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12072421 = 2767 ⋅4363.

It can be written as a sum of positive squares in 2 ways, for example, as 6734025 + 5692996 = 2595^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 12427021 - 2⁵ = 12426989 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 12427021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12427027) 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, 39420 + ... + 39733.

It is an arithmetic number, because the mean of its divisors is an integer number (3126583).

Almost surely, 2^12427021 is an apocalyptic number.

It is an amenable number.

12427021 is a deficient number, since it is larger than the sum of its proper divisors (79311).

12427021 is an equidigital number, since it uses as much as digits as its factorization.

12427021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79310.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 12427021 is about 3525.1980086231. The cubic root of 12427021 is about 231.6269085082.

Adding to 12427021 its reverse (12072421), we get a palindrome (24499442).

The spelling of 12427021 in words is "twelve million, four hundred twenty-seven thousand, twenty-one".