21075485 has 8 divisors (see below), whose sum is σ = 25322976. Its totient is φ = 16838800.

The previous prime is 21075473. The next prime is 21075487. The reversal of 21075485 is 58457012.

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

It is not a de Polignac number, because 21075485 - 2⁶ = 21075421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075487) 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, 2510 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (3165372).

Almost surely, 2^21075485 is an apocalyptic number.

It is an amenable number.

21075485 is a deficient number, since it is larger than the sum of its proper divisors (4247491).

21075485 is an equidigital number, since it uses as much as digits as its factorization.

21075485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 21075485 is about 4590.8043957459. The cubic root of 21075485 is about 276.2225896379. Note that the first 3 decimals are identical.

The spelling of 21075485 in words is "twenty-one million, seventy-five thousand, four hundred eighty-five".