12434021 has 4 divisors (see below), whose sum is σ = 13165452. Its totient is φ = 11702592.

The previous prime is 12434003. The next prime is 12434027. The reversal of 12434021 is 12043421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8473921 + 3960100 = 2911^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 12434021 - 2¹⁰ = 12432997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 731413 = 12434021 / (1 + 2 + 4 + 3 + 4 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12434027) 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, 365690 + ... + 365723.

It is an arithmetic number, because the mean of its divisors is an integer number (3291363).

Almost surely, 2^12434021 is an apocalyptic number.

It is an amenable number.

12434021 is a deficient number, since it is larger than the sum of its proper divisors (731431).

12434021 is an equidigital number, since it uses as much as digits as its factorization.

12434021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731430.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12434021 is about 3526.1907208771. The cubic root of 12434021 is about 231.6703912817.

Adding to 12434021 its reverse (12043421), we get a palindrome (24477442).

The spelling of 12434021 in words is "twelve million, four hundred thirty-four thousand, twenty-one".