12027421 has 4 divisors (see below), whose sum is σ = 13745632. Its totient is φ = 10309212.

The previous prime is 12027377. The next prime is 12027427. The reversal of 12027421 is 12472021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12472021 = 43 ⋅290047.

It is a cyclic number.

It is not a de Polignac number, because 12027421 - 2⁷ = 12027293 is a prime.

It is a super-2 number, since 2×12027421² = 289317711822482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12027427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 859095 + ... + 859108.

It is an arithmetic number, because the mean of its divisors is an integer number (3436408).

Almost surely, 2^12027421 is an apocalyptic number.

It is an amenable number.

12027421 is a deficient number, since it is larger than the sum of its proper divisors (1718211).

12027421 is an equidigital number, since it uses as much as digits as its factorization.

12027421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718210.

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

The square root of 12027421 is about 3468.0572371286. The cubic root of 12027421 is about 229.1171003471.

Adding to 12027421 its reverse (12472021), we get a palindrome (24499442).

It can be divided in two parts, 120274 and 21, that added together give a triangular number (120295 = T₄₉₀).

The spelling of 12027421 in words is "twelve million, twenty-seven thousand, four hundred twenty-one".