21384883 has 4 divisors (see below), whose sum is σ = 23029888. Its totient is φ = 19739880.

The previous prime is 21384877. The next prime is 21384887. The reversal of 21384883 is 38848312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21384883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21384887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822483 + ... + 822508.

It is an arithmetic number, because the mean of its divisors is an integer number (5757472).

Almost surely, 2^21384883 is an apocalyptic number.

21384883 is a deficient number, since it is larger than the sum of its proper divisors (1645005).

21384883 is a wasteful number, since it uses less digits than its factorization.

21384883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645004.

The product of its digits is 36864, while the sum is 37.

The square root of 21384883 is about 4624.3792015794. The cubic root of 21384883 is about 277.5677209393.

It can be divided in two parts, 2138 and 4883, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 21384883 in words is "twenty-one million, three hundred eighty-four thousand, eight hundred eighty-three".