21383359 has 4 divisors (see below), whose sum is σ = 21603904. Its totient is φ = 21162816.

The previous prime is 21383357. The next prime is 21383363. The reversal of 21383359 is 95338312.

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 21383359 - 2¹ = 21383357 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 (21383357) 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, 110127 + ... + 110320.

It is an arithmetic number, because the mean of its divisors is an integer number (5400976).

Almost surely, 2^21383359 is an apocalyptic number.

21383359 is a deficient number, since it is larger than the sum of its proper divisors (220545).

21383359 is an equidigital number, since it uses as much as digits as its factorization.

21383359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220544.

The product of its digits is 19440, while the sum is 34.

The square root of 21383359 is about 4624.2144197690. The cubic root of 21383359 is about 277.5611271341.

The spelling of 21383359 in words is "twenty-one million, three hundred eighty-three thousand, three hundred fifty-nine".