10021439 has 2 divisors, whose sum is σ = 10021440. Its totient is φ = 10021438.

The previous prime is 10021423. The next prime is 10021457. The reversal of 10021439 is 93412001.

10021439 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (93412001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021439 - 2⁴ = 10021423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10021439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010719 + 5010720.

It is an arithmetic number, because the mean of its divisors is an integer number (5010720).

Almost surely, 2^10021439 is an apocalyptic number.

10021439 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021439 is an equidigital number, since it uses as much as digits as its factorization.

10021439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 10021439 is about 3165.6656488012. The cubic root of 10021439 is about 215.5973221913.

The spelling of 10021439 in words is "ten million, twenty-one thousand, four hundred thirty-nine".