21104024 has 8 divisors (see below), whose sum is σ = 39570060. Its totient is φ = 10552008.

The previous prime is 21104011. The next prime is 21104029. The reversal of 21104024 is 42040112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318994 + ... + 1319009.

Almost surely, 2^21104024 is an apocalyptic number.

It is an amenable number.

21104024 is a deficient number, since it is larger than the sum of its proper divisors (18466036).

21104024 is a wasteful number, since it uses less digits than its factorization.

21104024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638009 (or 2638005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21104024 is about 4593.9116230071. The cubic root of 21104024 is about 276.3472140676.

Adding to 21104024 its reverse (42040112), we get a palindrome (63144136).

The spelling of 21104024 in words is "twenty-one million, one hundred four thousand, twenty-four".