21104242 has 16 divisors (see below), whose sum is σ = 34601472. Its totient is φ = 9610560.

The previous prime is 21104233. The next prime is 21104243. The reversal of 21104242 is 24240112.

It is not an unprimeable number, because it can be changed into a prime (21104243) 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, 8958 + ... + 11065.

It is an arithmetic number, because the mean of its divisors is an integer number (2162592).

Almost surely, 2^21104242 is an apocalyptic number.

21104242 is a deficient number, since it is larger than the sum of its proper divisors (13497230).

21104242 is a wasteful number, since it uses less digits than its factorization.

21104242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20073.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21104242 is about 4593.9353500022. The cubic root of 21104242 is about 276.3481656000.

Adding to 21104242 its reverse (24240112), we get a palindrome (45344354).

The spelling of 21104242 in words is "twenty-one million, one hundred four thousand, two hundred forty-two".