21041423539 has 2 divisors, whose sum is σ = 21041423540. Its totient is φ = 21041423538.

The previous prime is 21041423527. The next prime is 21041423563. The reversal of 21041423539 is 93532414012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041423539 - 2⁷ = 21041423411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041423839) 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, 10520711769 + 10520711770.

It is an arithmetic number, because the mean of its divisors is an integer number (10520711770).

Almost surely, 2^21041423539 is an apocalyptic number.

21041423539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041423539 is an equidigital number, since it uses as much as digits as its factorization.

21041423539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21041423539 in words is "twenty-one billion, forty-one million, four hundred twenty-three thousand, five hundred thirty-nine".