21303124 has 12 divisors (see below), whose sum is σ = 37806048. Its totient is φ = 10501400.

The previous prime is 21303109. The next prime is 21303127. The reversal of 21303124 is 42130312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21303098 and 21303107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37222 + ... + 37789.

It is an arithmetic number, because the mean of its divisors is an integer number (3150504).

Almost surely, 2^21303124 is an apocalyptic number.

It is an amenable number.

21303124 is a deficient number, since it is larger than the sum of its proper divisors (16502924).

21303124 is a wasteful number, since it uses less digits than its factorization.

21303124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75086 (or 75084 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21303124 is about 4615.5307387125. The cubic root of 21303124 is about 277.2135355116.

Adding to 21303124 its reverse (42130312), we get a palindrome (63433436).

The spelling of 21303124 in words is "twenty-one million, three hundred three thousand, one hundred twenty-four".