21004440300 has 108 divisors (see below), whose sum is σ = 65990524600. Its totient is φ = 5588144640.

The previous prime is 21004440299. The next prime is 21004440323. The reversal of 21004440300 is 304440012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 362751 + ... + 416649.

Almost surely, 2^21004440300 is an apocalyptic number.

21004440300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004440300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32995262300).

21004440300 is an abundant number, since it is smaller than the sum of its proper divisors (44986084300).

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

21004440300 is a wasteful number, since it uses less digits than its factorization.

21004440300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54352 (or 54342 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21004440300 its reverse (304440012), we get a palindrome (21308880312).

The spelling of 21004440300 in words is "twenty-one billion, four million, four hundred forty thousand, three hundred".