21043443431204 has 12 divisors (see below), whose sum is σ = 37151920040844. Its totient is φ = 10428609133824.

The previous prime is 21043443431177. The next prime is 21043443431207. The reversal of 21043443431204 is 40213434434012.

It can be written as a sum of positive squares in 2 ways, for example, as 8424622350400 + 12618821080804 = 2902520^2 + 3552298^2 .

It is a super-2 number, since 2×21043443431204² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21043443431207) 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, 23278144937 + ... + 23278145840.

It is an arithmetic number, because the mean of its divisors is an integer number (3095993336737).

Almost surely, 2^{21043443431204} is an apocalyptic number.

It is an amenable number.

21043443431204 is a deficient number, since it is larger than the sum of its proper divisors (16108476609640).

21043443431204 is a wasteful number, since it uses less digits than its factorization.

21043443431204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46556290894 (or 46556290892 counting only the distinct ones).

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

Adding to 21043443431204 its reverse (40213434434012), we get a palindrome (61256877865216).

The spelling of 21043443431204 in words is "twenty-one trillion, forty-three billion, four hundred forty-three million, four hundred thirty-one thousand, two hundred four".