21144434204 has 48 divisors (see below), whose sum is σ = 38234972160. Its totient is φ = 10225508160.

The previous prime is 21144434203. The next prime is 21144434261. The reversal of 21144434204 is 40243444112.

It is a super-2 number, since 2×21144434204² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144434203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7850282 + ... + 7852974.

It is an arithmetic number, because the mean of its divisors is an integer number (796561920).

Almost surely, 2^21144434204 is an apocalyptic number.

It is an amenable number.

21144434204 is a deficient number, since it is larger than the sum of its proper divisors (17090537956).

21144434204 is a wasteful number, since it uses less digits than its factorization.

21144434204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170 (or 3168 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21144434204 its reverse (40243444112), we get a palindrome (61387878316).

The spelling of 21144434204 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty-four thousand, two hundred four".