21033420439 has 2 divisors, whose sum is σ = 21033420440. Its totient is φ = 21033420438.

The previous prime is 21033420389. The next prime is 21033420479. The reversal of 21033420439 is 93402433012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033420439 - 2¹¹ = 21033418391 is a prime.

It is a super-3 number, since 3×21033420439³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21033420439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033420479) 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, 10516710219 + 10516710220.

It is an arithmetic number, because the mean of its divisors is an integer number (10516710220).

Almost surely, 2^21033420439 is an apocalyptic number.

21033420439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033420439 is an equidigital number, since it uses as much as digits as its factorization.

21033420439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The spelling of 21033420439 in words is "twenty-one billion, thirty-three million, four hundred twenty thousand, four hundred thirty-nine".