21242104 has 16 divisors (see below), whose sum is σ = 42892920. Its totient is φ = 9804000.

The previous prime is 21242101. The next prime is 21242131. The reversal of 21242104 is 40124212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102022 + ... + 102229.

Almost surely, 2^21242104 is an apocalyptic number.

It is an amenable number.

21242104 is an abundant number, since it is smaller than the sum of its proper divisors (21650816).

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

21242104 is a wasteful number, since it uses less digits than its factorization.

21242104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204270 (or 204266 counting only the distinct ones).

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

The square root of 21242104 is about 4608.9157076258. The cubic root of 21242104 is about 276.9486018099.

Adding to 21242104 its reverse (40124212), we get a palindrome (61366316).

The spelling of 21242104 in words is "twenty-one million, two hundred forty-two thousand, one hundred four".