21323284 has 6 divisors (see below), whose sum is σ = 37315754. Its totient is φ = 10661640.

The previous prime is 21323273. The next prime is 21323293. The reversal of 21323284 is 48232312.

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 1716100 = 4428^2 + 1310^2 .

It is a congruent 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 as a sum of consecutive naturals, namely, 2665407 + ... + 2665414.

Almost surely, 2^21323284 is an apocalyptic number.

It is an amenable number.

21323284 is a deficient number, since it is larger than the sum of its proper divisors (15992470).

21323284 is a wasteful number, since it uses less digits than its factorization.

21323284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330825 (or 5330823 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 21323284 is about 4617.7141531281. The cubic root of 21323284 is about 277.3009540343.

Adding to 21323284 its reverse (48232312), we get a palindrome (69555596).

The spelling of 21323284 in words is "twenty-one million, three hundred twenty-three thousand, two hundred eighty-four".