21331282 has 8 divisors (see below), whose sum is σ = 36567936. Its totient is φ = 9141972.

The previous prime is 21331267. The next prime is 21331283. The reversal of 21331282 is 28213312.

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

It is not an unprimeable number, because it can be changed into a prime (21331283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761818 + ... + 761845.

It is an arithmetic number, because the mean of its divisors is an integer number (4570992).

Almost surely, 2^21331282 is an apocalyptic number.

21331282 is a deficient number, since it is larger than the sum of its proper divisors (15236654).

21331282 is a wasteful number, since it uses less digits than its factorization.

21331282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523672.

The product of its digits is 576, while the sum is 22.

The square root of 21331282 is about 4618.5800848313. The cubic root of 21331282 is about 277.3356199860.

Adding to 21331282 its reverse (28213312), we get a palindrome (49544594).

The spelling of 21331282 in words is "twenty-one million, three hundred thirty-one thousand, two hundred eighty-two".