21221104444 has 6 divisors (see below), whose sum is σ = 37136932784. Its totient is φ = 10610552220.

The previous prime is 21221104439. The next prime is 21221104477. The reversal of 21221104444 is 44440112212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652638052 + ... + 2652638059.

Almost surely, 2^21221104444 is an apocalyptic number.

It is an amenable number.

21221104444 is a deficient number, since it is larger than the sum of its proper divisors (15915828340).

21221104444 is a wasteful number, since it uses less digits than its factorization.

21221104444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305276115 (or 5305276113 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21221104444 its reverse (44440112212), we get a palindrome (65661216656).

The spelling of 21221104444 in words is "twenty-one billion, two hundred twenty-one million, one hundred four thousand, four hundred forty-four".