21536983 has 8 divisors (see below), whose sum is σ = 23408000. Its totient is φ = 19696608.

The previous prime is 21536953. The next prime is 21536989. The reversal of 21536983 is 38963512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21536983 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 (21536989) 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, 6183 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (2926000).

Almost surely, 2^21536983 is an apocalyptic number.

21536983 is a deficient number, since it is larger than the sum of its proper divisors (1871017).

21536983 is a wasteful number, since it uses less digits than its factorization.

21536983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15321.

The product of its digits is 38880, while the sum is 37.

The square root of 21536983 is about 4640.7955137024. The cubic root of 21536983 is about 278.2242337980.

The spelling of 21536983 in words is "twenty-one million, five hundred thirty-six thousand, nine hundred eighty-three".