12436021 has 4 divisors (see below), whose sum is σ = 13392652. Its totient is φ = 11479392.

The previous prime is 12436007. The next prime is 12436043. The reversal of 12436021 is 12063421.

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 2739025 + 9696996 = 1655^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12436021 - 2⁹ = 12435509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12436021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12436091) 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, 478296 + ... + 478321.

It is an arithmetic number, because the mean of its divisors is an integer number (3348163).

Almost surely, 2^12436021 is an apocalyptic number.

It is an amenable number.

12436021 is a deficient number, since it is larger than the sum of its proper divisors (956631).

12436021 is an equidigital number, since it uses as much as digits as its factorization.

12436021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956630.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 12436021 is about 3526.4743016219. The cubic root of 12436021 is about 231.6828119337.

Adding to 12436021 its reverse (12063421), we get a palindrome (24499442).

The spelling of 12436021 in words is "twelve million, four hundred thirty-six thousand, twenty-one".