21303234 has 24 divisors (see below), whose sum is σ = 46525440. Its totient is φ = 7044408.

The previous prime is 21303229. The next prime is 21303241. The reversal of 21303234 is 43230312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2374 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (1938560).

Almost surely, 2^21303234 is an apocalyptic number.

21303234 is an abundant number, since it is smaller than the sum of its proper divisors (25222206).

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

21303234 is a wasteful number, since it uses less digits than its factorization.

21303234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9454 (or 9451 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21303234 is about 4615.5426549865. The cubic root of 21303234 is about 277.2140126472.

Adding to 21303234 its reverse (43230312), we get a palindrome (64533546).

The spelling of 21303234 in words is "twenty-one million, three hundred three thousand, two hundred thirty-four".