21105035 has 12 divisors (see below), whose sum is σ = 29461248. Its totient is φ = 14471856.

The previous prime is 21105023. The next prime is 21105043. The reversal of 21105035 is 53050112.

It is not a de Polignac number, because 21105035 - 2¹⁰ = 21104011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42827 + ... + 43316.

It is an arithmetic number, because the mean of its divisors is an integer number (2455104).

Almost surely, 2^21105035 is an apocalyptic number.

21105035 is a deficient number, since it is larger than the sum of its proper divisors (8356213).

21105035 is an equidigital number, since it uses as much as digits as its factorization.

21105035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86162 (or 86155 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 21105035 is about 4594.0216586342. The cubic root of 21105035 is about 276.3516268528.

Adding to 21105035 its reverse (53050112), we get a palindrome (74155147).

The spelling of 21105035 in words is "twenty-one million, one hundred five thousand, thirty-five".