21046105 has 4 divisors (see below), whose sum is σ = 25255332. Its totient is φ = 16836880.

The previous prime is 21046073. The next prime is 21046111. The reversal of 21046105 is 50164012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 7767369 = 3644^2 + 2787^2 .

It is not a de Polignac number, because 21046105 - 2⁵ = 21046073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104606 + ... + 2104615.

It is an arithmetic number, because the mean of its divisors is an integer number (6313833).

Almost surely, 2^21046105 is an apocalyptic number.

It is an amenable number.

21046105 is a deficient number, since it is larger than the sum of its proper divisors (4209227).

21046105 is an equidigital number, since it uses as much as digits as its factorization.

21046105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209226.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21046105 is about 4587.6034048291. The cubic root of 21046105 is about 276.0941751368.

The spelling of 21046105 in words is "twenty-one million, forty-six thousand, one hundred five".