21075936 has 96 divisors (see below), whose sum is σ = 64189440. Its totient is φ = 5930496.

The previous prime is 21075931. The next prime is 21075947. The reversal of 21075936 is 63957012.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21075897 and 21075906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075931) 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 15 ways as a sum of consecutive naturals, for example, 52890 + ... + 53286.

It is an arithmetic number, because the mean of its divisors is an integer number (668640).

Almost surely, 2^21075936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21075936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32094720).

21075936 is an abundant number, since it is smaller than the sum of its proper divisors (43113504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21075936 is a wasteful number, since it uses less digits than its factorization.

21075936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 21075936 is about 4590.8535154152. The cubic root of 21075936 is about 276.2245599444.

The spelling of 21075936 in words is "twenty-one million, seventy-five thousand, nine hundred thirty-six".