21003042239 has 2 divisors, whose sum is σ = 21003042240. Its totient is φ = 21003042238.

The previous prime is 21003042199. The next prime is 21003042259. The reversal of 21003042239 is 93224030012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003042239 is a prime.

It is a super-2 number, since 2×21003042239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003042259) 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, 10501521119 + 10501521120.

It is an arithmetic number, because the mean of its divisors is an integer number (10501521120).

Almost surely, 2^21003042239 is an apocalyptic number.

21003042239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003042239 is an equidigital number, since it uses as much as digits as its factorization.

21003042239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 21003042239 in words is "twenty-one billion, three million, forty-two thousand, two hundred thirty-nine".