21043140443 has 8 divisors (see below), whose sum is σ = 22797545568. Its totient is φ = 19308121344.

The previous prime is 21043140439. The next prime is 21043140467. The reversal of 21043140443 is 34404134012.

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 21043140443 - 2² = 21043140439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043140043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4844246 + ... + 4848587.

It is an arithmetic number, because the mean of its divisors is an integer number (2849693196).

Almost surely, 2^21043140443 is an apocalyptic number.

21043140443 is a deficient number, since it is larger than the sum of its proper divisors (1754405125).

21043140443 is a wasteful number, since it uses less digits than its factorization.

21043140443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9693013.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21043140443 its reverse (34404134012), we get a palindrome (55447274455).

The spelling of 21043140443 in words is "twenty-one billion, forty-three million, one hundred forty thousand, four hundred forty-three".