21204332444 has 24 divisors (see below), whose sum is σ = 38561712000. Its totient is φ = 10191291840.

The previous prime is 21204332393. The next prime is 21204332447. The reversal of 21204332444 is 44423340212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204332447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555359 + ... + 592310.

It is an arithmetic number, because the mean of its divisors is an integer number (1606738000).

Almost surely, 2^21204332444 is an apocalyptic number.

It is an amenable number.

21204332444 is a deficient number, since it is larger than the sum of its proper divisors (17357379556).

21204332444 is a wasteful number, since it uses less digits than its factorization.

21204332444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147853 (or 1147851 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21204332444 its reverse (44423340212), we get a palindrome (65627672656).

The spelling of 21204332444 in words is "twenty-one billion, two hundred four million, three hundred thirty-two thousand, four hundred forty-four".