120021439 has 2 divisors, whose sum is σ = 120021440. Its totient is φ = 120021438.

The previous prime is 120021427. The next prime is 120021443. The reversal of 120021439 is 934120021.

It is a strong prime.

It is an emirp because it is prime and its reverse (934120021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120021439 - 2¹³ = 120013247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120028439) 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, 60010719 + 60010720.

It is an arithmetic number, because the mean of its divisors is an integer number (60010720).

Almost surely, 2^120021439 is an apocalyptic number.

120021439 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021439 is an equidigital number, since it uses as much as digits as its factorization.

120021439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 120021439 is about 10955.4296583931. The cubic root of 120021439 is about 493.2717870729.

The spelling of 120021439 in words is "one hundred twenty million, twenty-one thousand, four hundred thirty-nine".