21443041999 has 4 divisors (see below), whose sum is σ = 21532762080. Its totient is φ = 21353321920.

The previous prime is 21443041981. The next prime is 21443042003. The reversal of 21443041999 is 99914034412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21443041999 - 2⁷ = 21443041871 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 (21443048999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44859682 + ... + 44860159.

It is an arithmetic number, because the mean of its divisors is an integer number (5383190520).

Almost surely, 2^21443041999 is an apocalyptic number.

21443041999 is a deficient number, since it is larger than the sum of its proper divisors (89720081).

21443041999 is an equidigital number, since it uses as much as digits as its factorization.

21443041999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89720080.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 21443041999 in words is "twenty-one billion, four hundred forty-three million, forty-one thousand, nine hundred ninety-nine".