2021105 has 4 divisors (see below), whose sum is σ = 2425332. Its totient is φ = 1616880.

The previous prime is 2021099. The next prime is 2021119. The reversal of 2021105 is 5011202.

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 1129969 + 891136 = 1063^2 + 944^2 .

It is not a de Polignac number, because 2021105 - 2¹² = 2017009 is a prime.

It is a Duffinian number.

It is a Curzon 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, 202106 + ... + 202115.

It is an arithmetic number, because the mean of its divisors is an integer number (606333).

2^2021105 is an apocalyptic number.

It is an amenable number.

2021105 is a deficient number, since it is larger than the sum of its proper divisors (404227).

2021105 is an equidigital number, since it uses as much as digits as its factorization.

2021105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404226.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2021105 is about 1421.6557248504. The cubic root of 2021105 is about 126.4337324180.

Adding to 2021105 its reverse (5011202), we get a palindrome (7032307).

The spelling of 2021105 in words is "two million, twenty-one thousand, one hundred five".