21303104 has 28 divisors (see below), whose sum is σ = 44500800. Its totient is φ = 10090368.

The previous prime is 21303059. The next prime is 21303109. The reversal of 21303104 is 40130312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303109) 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, 7544 + ... + 9975.

Almost surely, 2^21303104 is an apocalyptic number.

It is an amenable number.

21303104 is an abundant number, since it is smaller than the sum of its proper divisors (23197696).

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

21303104 is a wasteful number, since it uses less digits than its factorization.

21303104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17550 (or 17540 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21303104 is about 4615.5285721139. The cubic root of 21303104 is about 277.2134487595.

Adding to 21303104 its reverse (40130312), we get a palindrome (61433416).

The spelling of 21303104 in words is "twenty-one million, three hundred three thousand, one hundred four".