21048785 has 8 divisors (see below), whose sum is σ = 25874856. Its totient is φ = 16428160.

The previous prime is 21048761. The next prime is 21048793. The reversal of 21048785 is 58784012.

It can be written as a sum of positive squares in 4 ways, for example, as 99856 + 20948929 = 316^2 + 4577^2 .

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

It is not a de Polignac number, because 21048785 - 2²⁴ = 4271569 is a prime.

It is a Duffinian 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, 51134 + ... + 51543.

It is an arithmetic number, because the mean of its divisors is an integer number (3234357).

Almost surely, 2^21048785 is an apocalyptic number.

It is an amenable number.

21048785 is a deficient number, since it is larger than the sum of its proper divisors (4826071).

21048785 is a wasteful number, since it uses less digits than its factorization.

21048785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102723.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21048785 is about 4587.8954870398. The cubic root of 21048785 is about 276.1058938687.

The spelling of 21048785 in words is "twenty-one million, forty-eight thousand, seven hundred eighty-five".