21841105 has 24 divisors (see below), whose sum is σ = 31035816. Its totient is φ = 14657280.

The previous prime is 21841103. The next prime is 21841109. The reversal of 21841105 is 50114812.

21841105 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 88209 + 21752896 = 297^2 + 4664^2 .

It is not a de Polignac number, because 21841105 - 2¹ = 21841103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21841103) 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 23 ways as a sum of consecutive naturals, for example, 6477 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (1293159).

Almost surely, 2^21841105 is an apocalyptic number.

It is an amenable number.

21841105 is a deficient number, since it is larger than the sum of its proper divisors (9194711).

21841105 is a wasteful number, since it uses less digits than its factorization.

21841105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817 (or 2806 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 21841105 is about 4673.4468008099. The cubic root of 21841105 is about 279.5277114708.

Adding to 21841105 its reverse (50114812), we get a palindrome (71955917).

The spelling of 21841105 in words is "twenty-one million, eight hundred forty-one thousand, one hundred five".