21302105 has 16 divisors (see below), whose sum is σ = 29528064. Its totient is φ = 14580480.

The previous prime is 21302093. The next prime is 21302111. The reversal of 21302105 is 50120312.

It is a happy number.

It is not a de Polignac number, because 21302105 - 2⁸ = 21301849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302105.

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 15 ways as a sum of consecutive naturals, for example, 10457 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (1845504).

Almost surely, 2^21302105 is an apocalyptic number.

It is an amenable number.

21302105 is a deficient number, since it is larger than the sum of its proper divisors (8225959).

21302105 is a wasteful number, since it uses less digits than its factorization.

21302105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22816.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21302105 is about 4615.4203492206. The cubic root of 21302105 is about 277.2091154229.

Adding to 21302105 its reverse (50120312), we get a palindrome (71422417).

The spelling of 21302105 in words is "twenty-one million, three hundred two thousand, one hundred five".