21536105 has 16 divisors (see below), whose sum is σ = 26659584. Its totient is φ = 16692480.

The previous prime is 21536089. The next prime is 21536107. The reversal of 21536105 is 50163512.

It is not a de Polignac number, because 21536105 - 2⁴ = 21536089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21536107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26150 + ... + 26960.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^21536105 is an apocalyptic number.

It is an amenable number.

21536105 is a deficient number, since it is larger than the sum of its proper divisors (5123479).

21536105 is a wasteful number, since it uses less digits than its factorization.

21536105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 21536105 is about 4640.7009168874. The cubic root of 21536105 is about 278.2204529497.

Adding to 21536105 its reverse (50163512), we get a palindrome (71699617).

The spelling of 21536105 in words is "twenty-one million, five hundred thirty-six thousand, one hundred five".