12072421 has 4 divisors (see below), whose sum is σ = 12079552. Its totient is φ = 12065292.

The previous prime is 12072419. The next prime is 12072457. The reversal of 12072421 is 12427021.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12427021 = 157 ⋅79153.

It is a cyclic number.

It is not a de Polignac number, because 12072421 - 2¹ = 12072419 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 (12072721) 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, 586 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (3019888).

Almost surely, 2^12072421 is an apocalyptic number.

It is an amenable number.

12072421 is a deficient number, since it is larger than the sum of its proper divisors (7131).

12072421 is an equidigital number, since it uses as much as digits as its factorization.

12072421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130.

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

The square root of 12072421 is about 3474.5389622222. The cubic root of 12072421 is about 229.4024881490.

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

The spelling of 12072421 in words is "twelve million, seventy-two thousand, four hundred twenty-one".