21443204204 has 6 divisors (see below), whose sum is σ = 37525607364. Its totient is φ = 10721602100.

The previous prime is 21443204203. The next prime is 21443204219. The reversal of 21443204204 is 40240234412.

It is a happy number.

It is a super-2 number, since 2×21443204204² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21443204203) 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 as a sum of consecutive naturals, namely, 2680400522 + ... + 2680400529.

It is an arithmetic number, because the mean of its divisors is an integer number (6254267894).

Almost surely, 2^21443204204 is an apocalyptic number.

It is an amenable number.

21443204204 is a deficient number, since it is larger than the sum of its proper divisors (16082403160).

21443204204 is a wasteful number, since it uses less digits than its factorization.

21443204204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360801055 (or 5360801053 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21443204204 its reverse (40240234412), we get a palindrome (61683438616).

The spelling of 21443204204 in words is "twenty-one billion, four hundred forty-three million, two hundred four thousand, two hundred four".