21005040403999 has 8 divisors (see below), whose sum is σ = 21049093296000. Its totient is φ = 20960988350592.

The previous prime is 21005040403987. The next prime is 21005040404057. The reversal of 21005040403999 is 99930404050012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21005040403999 - 2⁵ = 21005040403967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005040403939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99952867 + ... + 100162795.

It is an arithmetic number, because the mean of its divisors is an integer number (2631136662000).

Almost surely, 2^{21005040403999} is an apocalyptic number.

21005040403999 is a deficient number, since it is larger than the sum of its proper divisors (44052892001).

21005040403999 is a wasteful number, since it uses less digits than its factorization.

21005040403999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419297.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 21005040403999 in words is "twenty-one trillion, five billion, forty million, four hundred three thousand, nine hundred ninety-nine".