21300573 has 16 divisors (see below), whose sum is σ = 32944640. Its totient is φ = 11989296.

The previous prime is 21300571. The next prime is 21300583. The reversal of 21300573 is 37500312.

It is a happy number.

It is not a de Polignac number, because 21300573 - 2¹ = 21300571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300571) 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 15 ways as a sum of consecutive naturals, for example, 6163 + ... + 8976.

It is an arithmetic number, because the mean of its divisors is an integer number (2059040).

Almost surely, 2^21300573 is an apocalyptic number.

It is an amenable number.

21300573 is a deficient number, since it is larger than the sum of its proper divisors (11644067).

21300573 is a wasteful number, since it uses less digits than its factorization.

21300573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15216.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 21300573 is about 4615.2543808549. The cubic root of 21300573 is about 277.2024698426.

Adding to 21300573 its reverse (37500312), we get a palindrome (58800885).

The spelling of 21300573 in words is "twenty-one million, three hundred thousand, five hundred seventy-three".