21045282 has 16 divisors (see below), whose sum is σ = 42200352. Its totient is φ = 6996800.

The previous prime is 21045263. The next prime is 21045287. The reversal of 21045282 is 28254012.

It is not an unprimeable number, because it can be changed into a prime (21045287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1968 + ... + 6779.

It is an arithmetic number, because the mean of its divisors is an integer number (2637522).

Almost surely, 2^21045282 is an apocalyptic number.

21045282 is an abundant number, since it is smaller than the sum of its proper divisors (21155070).

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

21045282 is a wasteful number, since it uses less digits than its factorization.

21045282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9153.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21045282 is about 4587.5137057016. The cubic root of 21045282 is about 276.0905762370.

Adding to 21045282 its reverse (28254012), we get a palindrome (49299294).

The spelling of 21045282 in words is "twenty-one million, forty-five thousand, two hundred eighty-two".