21043443432104 has 32 divisors (see below), whose sum is σ = 39820448448000. Its totient is φ = 10424666907072.

The previous prime is 21043443432049. The next prime is 21043443432133. The reversal of 21043443432104 is 40123434434012.

It is a super-2 number, since 2×21043443432104² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17001737 + ... + 18197415.

It is an arithmetic number, because the mean of its divisors is an integer number (1244389014000).

Almost surely, 2^{21043443432104} is an apocalyptic number.

It is an amenable number.

21043443432104 is a deficient number, since it is larger than the sum of its proper divisors (18777005015896).

21043443432104 is a wasteful number, since it uses less digits than its factorization.

21043443432104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215977 (or 1215973 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21043443432104 its reverse (40123434434012), we get a palindrome (61166877866116).

The spelling of 21043443432104 in words is "twenty-one trillion, forty-three billion, four hundred forty-three million, four hundred thirty-two thousand, one hundred four".