21282863 has 4 divisors (see below), whose sum is σ = 24323280. Its totient is φ = 18242448.

The previous prime is 21282857. The next prime is 21282871. The reversal of 21282863 is 36828212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21282863 - 2⁴ = 21282847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520198 + ... + 1520211.

It is an arithmetic number, because the mean of its divisors is an integer number (6080820).

Almost surely, 2^21282863 is an apocalyptic number.

21282863 is a deficient number, since it is larger than the sum of its proper divisors (3040417).

21282863 is an equidigital number, since it uses as much as digits as its factorization.

21282863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040416.

The product of its digits is 9216, while the sum is 32.

The square root of 21282863 is about 4613.3353444119. The cubic root of 21282863 is about 277.1256234444.

The spelling of 21282863 in words is "twenty-one million, two hundred eighty-two thousand, eight hundred sixty-three".