21104444 has 6 divisors (see below), whose sum is σ = 36932784. Its totient is φ = 10552220.

The previous prime is 21104407. The next prime is 21104453. The reversal of 21104444 is 44440112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638052 + ... + 2638059.

It is an arithmetic number, because the mean of its divisors is an integer number (6155464).

Almost surely, 2^21104444 is an apocalyptic number.

It is an amenable number.

21104444 is a deficient number, since it is larger than the sum of its proper divisors (15828340).

21104444 is a wasteful number, since it uses less digits than its factorization.

21104444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276115 (or 5276113 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 21104444 is about 4593.9573354571. The cubic root of 21104444 is about 276.3490472892.

Adding to 21104444 its reverse (44440112), we get a palindrome (65544556).

The spelling of 21104444 in words is "twenty-one million, one hundred four thousand, four hundred forty-four".