12440011021 has 2 divisors, whose sum is σ = 12440011022. Its totient is φ = 12440011020.

The previous prime is 12440011019. The next prime is 12440011039. The reversal of 12440011021 is 12011004421.

It is a happy number.

12440011021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10759912900 + 1680098121 = 103730^2 + 40989^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440011021 - 2¹ = 12440011019 is a prime.

Together with 12440011019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12440010986 and 12440011004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440011091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220005510 + 6220005511.

It is an arithmetic number, because the mean of its divisors is an integer number (6220005511).

Almost surely, 2^12440011021 is an apocalyptic number.

It is an amenable number.

12440011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440011021 is an equidigital number, since it uses as much as digits as its factorization.

12440011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12440011021 its reverse (12011004421), we get a palindrome (24451015442).

The spelling of 12440011021 in words is "twelve billion, four hundred forty million, eleven thousand, twenty-one".