21300085 has 8 divisors (see below), whose sum is σ = 25637976. Its totient is φ = 16988160.

The previous prime is 21300077. The next prime is 21300089. The reversal of 21300085 is 58000312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 715716 + 20584369 = 846^2 + 4537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21300085 - 2³ = 21300077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300089) 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 7 ways as a sum of consecutive naturals, for example, 4636 + ... + 8005.

It is an arithmetic number, because the mean of its divisors is an integer number (3204747).

Almost surely, 2^21300085 is an apocalyptic number.

It is an amenable number.

21300085 is a deficient number, since it is larger than the sum of its proper divisors (4337891).

21300085 is a wasteful number, since it uses less digits than its factorization.

21300085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12983.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21300085 is about 4615.2015123936. The cubic root of 21300085 is about 277.2003529068.

Adding to 21300085 its reverse (58000312), we get a palindrome (79300397).

The spelling of 21300085 in words is "twenty-one million, three hundred thousand, eighty-five".