21204041239 has 2 divisors, whose sum is σ = 21204041240. Its totient is φ = 21204041238.

The previous prime is 21204041233. The next prime is 21204041317. The reversal of 21204041239 is 93214040212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21204041239 - 2⁵ = 21204041207 is a prime.

It is a super-2 number, since 2×21204041239² (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 (21204041233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602020619 + 10602020620.

It is an arithmetic number, because the mean of its divisors is an integer number (10602020620).

Almost surely, 2^21204041239 is an apocalyptic number.

21204041239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204041239 is an equidigital number, since it uses as much as digits as its factorization.

21204041239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21204041239 in words is "twenty-one billion, two hundred four million, forty-one thousand, two hundred thirty-nine".