21104744 has 32 divisors (see below), whose sum is σ = 42636000. Its totient is φ = 9761472.

The previous prime is 21104729. The next prime is 21104747. The reversal of 21104744 is 44740112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21104747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4922 + ... + 8150.

It is an arithmetic number, because the mean of its divisors is an integer number (1332375).

Almost surely, 2^21104744 is an apocalyptic number.

It is an amenable number.

21104744 is an abundant number, since it is smaller than the sum of its proper divisors (21531256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104744 is a wasteful number, since it uses less digits than its factorization.

21104744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297 (or 3293 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 21104744 is about 4593.9899869286. The cubic root of 21104744 is about 276.3503567184.

Adding to 21104744 its reverse (44740112), we get a palindrome (65844856).

The spelling of 21104744 in words is "twenty-one million, one hundred four thousand, seven hundred forty-four".