21004423039 has 2 divisors, whose sum is σ = 21004423040. Its totient is φ = 21004423038.

The previous prime is 21004423019. The next prime is 21004423043. The reversal of 21004423039 is 93032440012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21004423039 - 2¹⁷ = 21004291967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21004422998 and 21004423016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004423019) 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, 10502211519 + 10502211520.

It is an arithmetic number, because the mean of its divisors is an integer number (10502211520).

Almost surely, 2^21004423039 is an apocalyptic number.

21004423039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004423039 is an equidigital number, since it uses as much as digits as its factorization.

21004423039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21004423039 in words is "twenty-one billion, four million, four hundred twenty-three thousand, thirty-nine".