21284883 has 16 divisors (see below), whose sum is σ = 33193600. Its totient is φ = 13442760.

The previous prime is 21284839. The next prime is 21284903. The reversal of 21284883 is 38848212.

It is a happy number.

It is not a de Polignac number, because 21284883 - 2¹⁰ = 21283859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21284983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20233 + ... + 21258.

It is an arithmetic number, because the mean of its divisors is an integer number (2074600).

Almost surely, 2^21284883 is an apocalyptic number.

21284883 is a deficient number, since it is larger than the sum of its proper divisors (11908717).

21284883 is a wasteful number, since it uses less digits than its factorization.

21284883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41519 (or 41513 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 21284883 is about 4613.5542697578. The cubic root of 21284883 is about 277.1343906867.

The spelling of 21284883 in words is "twenty-one million, two hundred eighty-four thousand, eight hundred eighty-three".