21648883 has 4 divisors (see below), whose sum is σ = 21673360. Its totient is φ = 21624408.

The previous prime is 21648863. The next prime is 21648889. The reversal of 21648883 is 38884612.

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

It is a cyclic number.

It is not a de Polignac number, because 21648883 - 2¹³ = 21640691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21648889) 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, 10860 + ... + 12697.

It is an arithmetic number, because the mean of its divisors is an integer number (5418340).

Almost surely, 2^21648883 is an apocalyptic number.

21648883 is a deficient number, since it is larger than the sum of its proper divisors (24477).

21648883 is an equidigital number, since it uses as much as digits as its factorization.

21648883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24476.

The product of its digits is 73728, while the sum is 40.

The square root of 21648883 is about 4652.8360168826. The cubic root of 21648883 is about 278.7052594981.

The spelling of 21648883 in words is "twenty-one million, six hundred forty-eight thousand, eight hundred eighty-three".