21163282 has 8 divisors (see below), whose sum is σ = 36279936. Its totient is φ = 9069972.

The previous prime is 21163253. The next prime is 21163291. The reversal of 21163282 is 28236112.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 755818 + ... + 755845.

It is an arithmetic number, because the mean of its divisors is an integer number (4534992).

Almost surely, 2^21163282 is an apocalyptic number.

21163282 is a deficient number, since it is larger than the sum of its proper divisors (15116654).

21163282 is a wasteful number, since it uses less digits than its factorization.

21163282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511672.

The product of its digits is 1152, while the sum is 25.

The square root of 21163282 is about 4600.3567252986. The cubic root of 21163282 is about 276.6056241839.

Adding to 21163282 its reverse (28236112), we get a palindrome (49399394).

The spelling of 21163282 in words is "twenty-one million, one hundred sixty-three thousand, two hundred eighty-two".