21120403300 has 72 divisors (see below), whose sum is σ = 46619516160. Its totient is φ = 8303433600.

The previous prime is 21120403229. The next prime is 21120403309. The reversal of 21120403300 is 330402112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21120403309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3206010 + ... + 3212590.

It is an arithmetic number, because the mean of its divisors is an integer number (647493280).

Almost surely, 2^21120403300 is an apocalyptic number.

21120403300 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 21120403300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23309758080).

21120403300 is an abundant number, since it is smaller than the sum of its proper divisors (25499112860).

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

21120403300 is a wasteful number, since it uses less digits than its factorization.

21120403300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141 (or 7134 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21120403300 its reverse (330402112), we get a palindrome (21450805412).

The spelling of 21120403300 in words is "twenty-one billion, one hundred twenty million, four hundred three thousand, three hundred".