21530935 has 8 divisors (see below), whose sum is σ = 26387136. Its totient is φ = 16858080.

The previous prime is 21530911. The next prime is 21530953. The reversal of 21530935 is 53903512.

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

It is not a de Polignac number, because 21530935 - 2⁵ = 21530903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 45576 + ... + 46045.

It is an arithmetic number, because the mean of its divisors is an integer number (3298392).

Almost surely, 2^21530935 is an apocalyptic number.

21530935 is a deficient number, since it is larger than the sum of its proper divisors (4856201).

21530935 is an equidigital number, since it uses as much as digits as its factorization.

21530935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91673.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 21530935 is about 4640.1438555286. The cubic root of 21530935 is about 278.1981877837.

The spelling of 21530935 in words is "twenty-one million, five hundred thirty thousand, nine hundred thirty-five".