21300413 has 4 divisors (see below), whose sum is σ = 22034940. Its totient is φ = 20565888.

The previous prime is 21300403. The next prime is 21300421. The reversal of 21300413 is 31400312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6959044 + 14341369 = 2638^2 + 3787^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300413 - 2¹⁶ = 21234877 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 (21300403) 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 3 ways as a sum of consecutive naturals, for example, 367220 + ... + 367277.

It is an arithmetic number, because the mean of its divisors is an integer number (5508735).

Almost surely, 2^21300413 is an apocalyptic number.

It is an amenable number.

21300413 is a deficient number, since it is larger than the sum of its proper divisors (734527).

21300413 is an equidigital number, since it uses as much as digits as its factorization.

21300413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734526.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21300413 is about 4615.2370469999. The cubic root of 21300413 is about 277.2017757688.

Adding to 21300413 its reverse (31400312), we get a palindrome (52700725).

The spelling of 21300413 in words is "twenty-one million, three hundred thousand, four hundred thirteen".