21033234239 has 2 divisors, whose sum is σ = 21033234240. Its totient is φ = 21033234238.

The previous prime is 21033234227. The next prime is 21033234307. The reversal of 21033234239 is 93243233012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21033234239 - 2⁸ = 21033233983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033234539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516617119 + 10516617120.

It is an arithmetic number, because the mean of its divisors is an integer number (10516617120).

Almost surely, 2^21033234239 is an apocalyptic number.

21033234239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033234239 is an equidigital number, since it uses as much as digits as its factorization.

21033234239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

The spelling of 21033234239 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, two hundred thirty-nine".