21301105 has 32 divisors (see below), whose sum is σ = 31186944. Its totient is φ = 13649856.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301105 is 50110312.

It is not a de Polignac number, because 21301105 - 2³ = 21301097 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 37554 + ... + 38116.

It is an arithmetic number, because the mean of its divisors is an integer number (974592).

Almost surely, 2^21301105 is an apocalyptic number.

It is an amenable number.

21301105 is a deficient number, since it is larger than the sum of its proper divisors (9885839).

21301105 is a wasteful number, since it uses less digits than its factorization.

21301105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 21301105 is about 4615.3120154546. The cubic root of 21301105 is about 277.2047776128.

Adding to 21301105 its reverse (50110312), we get a palindrome (71411417).

The spelling of 21301105 in words is "twenty-one million, three hundred one thousand, one hundred five".