21283336 has 8 divisors (see below), whose sum is σ = 39906270. Its totient is φ = 10641664.

The previous prime is 21283333. The next prime is 21283351. The reversal of 21283336 is 63338212.

It can be written as a sum of positive squares in only one way, i.e., 10850436 + 10432900 = 3294^2 + 3230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21283331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330201 + ... + 1330216.

Almost surely, 2^21283336 is an apocalyptic number.

It is an amenable number.

21283336 is a deficient number, since it is larger than the sum of its proper divisors (18622934).

21283336 is a wasteful number, since it uses less digits than its factorization.

21283336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660423 (or 2660419 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 21283336 is about 4613.3866085556. The cubic root of 21283336 is about 277.1276764177.

The spelling of 21283336 in words is "twenty-one million, two hundred eighty-three thousand, three hundred thirty-six".