21300450 has 48 divisors (see below), whose sum is σ = 53154336. Its totient is φ = 5644800.

The previous prime is 21300431. The next prime is 21300467. The reversal of 21300450 is 5400312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31314 + ... + 31986.

It is an arithmetic number, because the mean of its divisors is an integer number (1107382).

Almost surely, 2^21300450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21300450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26577168).

21300450 is an abundant number, since it is smaller than the sum of its proper divisors (31853886).

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

21300450 is a wasteful number, since it uses less digits than its factorization.

21300450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21300450 is about 4615.2410554596. The cubic root of 21300450 is about 277.2019362737.

Adding to 21300450 its reverse (5400312), we get a palindrome (26700762).

The spelling of 21300450 in words is "twenty-one million, three hundred thousand, four hundred fifty".