21133443043 has 4 divisors (see below), whose sum is σ = 21146433880. Its totient is φ = 21120452208.

The previous prime is 21133443011. The next prime is 21133443047. The reversal of 21133443043 is 34034433112.

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 21133443043 - 2⁵ = 21133443011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133443047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6492978 + ... + 6496231.

It is an arithmetic number, because the mean of its divisors is an integer number (5286608470).

Almost surely, 2^21133443043 is an apocalyptic number.

21133443043 is a deficient number, since it is larger than the sum of its proper divisors (12990837).

21133443043 is a wasteful number, since it uses less digits than its factorization.

21133443043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990836.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21133443043 its reverse (34034433112), we get a palindrome (55167876155).

The spelling of 21133443043 in words is "twenty-one billion, one hundred thirty-three million, four hundred forty-three thousand, forty-three".