21043004433 has 32 divisors (see below), whose sum is σ = 30826723200. Its totient is φ = 12662438400.

The previous prime is 21043004429. The next prime is 21043004441. The reversal of 21043004433 is 33440034012.

It is not a de Polignac number, because 21043004433 - 2² = 21043004429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21043004443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4232373 + ... + 4237341.

It is an arithmetic number, because the mean of its divisors is an integer number (963335100).

Almost surely, 2^21043004433 is an apocalyptic number.

It is an amenable number.

21043004433 is a deficient number, since it is larger than the sum of its proper divisors (9783718767).

21043004433 is a wasteful number, since it uses less digits than its factorization.

21043004433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21043004433 its reverse (33440034012), we get a palindrome (54483038445).

The spelling of 21043004433 in words is "twenty-one billion, forty-three million, four thousand, four hundred thirty-three".