21358282 has 16 divisors (see below), whose sum is σ = 35395200. Its totient is φ = 9584640.

The previous prime is 21358277. The next prime is 21358289. The reversal of 21358282 is 28285312.

It is not an unprimeable number, because it can be changed into a prime (21358289) 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 7 ways as a sum of consecutive naturals, for example, 4407 + ... + 7882.

It is an arithmetic number, because the mean of its divisors is an integer number (2212200).

Almost surely, 2^21358282 is an apocalyptic number.

21358282 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21358282 is a deficient number, since it is larger than the sum of its proper divisors (14036918).

21358282 is a wasteful number, since it uses less digits than its factorization.

21358282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12381.

The product of its digits is 7680, while the sum is 31.

The square root of 21358282 is about 4621.5021367516. The cubic root of 21358282 is about 277.4525828675.

The spelling of 21358282 in words is "twenty-one million, three hundred fifty-eight thousand, two hundred eighty-two".