21000104240539 has 2 divisors, whose sum is σ = 21000104240540. Its totient is φ = 21000104240538.

The previous prime is 21000104240509. The next prime is 21000104240611. The reversal of 21000104240539 is 93504240100012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000104240539 - 2²⁵ = 21000070686107 is a prime.

It is a super-2 number, since 2×21000104240539² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21000104240539.

It is not a weakly prime, because it can be changed into another prime (21000104240509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500052120269 + 10500052120270.

It is an arithmetic number, because the mean of its divisors is an integer number (10500052120270).

Almost surely, 2^{21000104240539} is an apocalyptic number.

21000104240539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000104240539 is an equidigital number, since it uses as much as digits as its factorization.

21000104240539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21000104240539 in words is "twenty-one trillion, one hundred four million, two hundred forty thousand, five hundred thirty-nine".