21084282 has 24 divisors (see below), whose sum is σ = 45782100. Its totient is φ = 7012800.

The previous prime is 21084269. The next prime is 21084289. The reversal of 21084282 is 28248012.

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 2499561 = 4311^2 + 1581^2 .

It is not an unprimeable number, because it can be changed into a prime (21084289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9844 + ... + 11792.

Almost surely, 2^21084282 is an apocalyptic number.

21084282 is an abundant number, since it is smaller than the sum of its proper divisors (24697818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21084282 is a wasteful number, since it uses less digits than its factorization.

21084282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558 (or 2555 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21084282 is about 4591.7624067454. The cubic root of 21084282 is about 276.2610164659.

The spelling of 21084282 in words is "twenty-one million, eighty-four thousand, two hundred eighty-two".