21383755 has 8 divisors (see below), whose sum is σ = 26286624. Its totient is φ = 16689600.

The previous prime is 21383753. The next prime is 21383777. The reversal of 21383755 is 55738312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21383755 - 2¹ = 21383753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21383755.

It is not an unprimeable number, because it can be changed into a prime (21383753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51951 + ... + 52360.

It is an arithmetic number, because the mean of its divisors is an integer number (3285828).

Almost surely, 2^21383755 is an apocalyptic number.

21383755 is a deficient number, since it is larger than the sum of its proper divisors (4902869).

21383755 is a wasteful number, since it uses less digits than its factorization.

21383755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104357.

The product of its digits is 25200, while the sum is 34.

The square root of 21383755 is about 4624.2572376545. The cubic root of 21383755 is about 277.5628405152.

The spelling of 21383755 in words is "twenty-one million, three hundred eighty-three thousand, seven hundred fifty-five".