21300416 has 28 divisors (see below), whose sum is σ = 42992040. Its totient is φ = 10467840.

The previous prime is 21300403. The next prime is 21300421. The reversal of 21300416 is 61400312.

It is a junction number, because it is equal to n+sod(n) for n = 21300394 and 21300403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 6596.

It is an arithmetic number, because the mean of its divisors is an integer number (1535430).

Almost surely, 2^21300416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21300416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21496020).

21300416 is an abundant number, since it is smaller than the sum of its proper divisors (21691624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21300416 is an equidigital number, since it uses as much as digits as its factorization.

21300416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21300416 is about 4615.2373720102. The cubic root of 21300416 is about 277.2017887827.

Adding to 21300416 its reverse (61400312), we get a palindrome (82700728).

The spelling of 21300416 in words is "twenty-one million, three hundred thousand, four hundred sixteen".