21083228 has 6 divisors (see below), whose sum is σ = 36895656. Its totient is φ = 10541612.

The previous prime is 21083197. The next prime is 21083233. The reversal of 21083228 is 82238012.

It is a junction number, because it is equal to n+sod(n) for n = 21083197 and 21083206.

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, 2635400 + ... + 2635407.

It is an arithmetic number, because the mean of its divisors is an integer number (6149276).

Almost surely, 2^21083228 is an apocalyptic number.

It is an amenable number.

21083228 is a deficient number, since it is larger than the sum of its proper divisors (15812428).

21083228 is a wasteful number, since it uses less digits than its factorization.

21083228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270811 (or 5270809 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21083228 is about 4591.6476345643. The cubic root of 21083228 is about 276.2564129740.

It can be divided in two parts, 210 and 83228, that added together give a palindrome (83438).

The spelling of 21083228 in words is "twenty-one million, eighty-three thousand, two hundred twenty-eight".