21020300224 has 112 divisors (see below), whose sum is σ = 52130163456. Its totient is φ = 8169984000.

The previous prime is 21020300167. The next prime is 21020300243. The reversal of 21020300224 is 42200302012.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21020300198 and 21020300207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2128899 + ... + 2138749.

It is an arithmetic number, because the mean of its divisors is an integer number (465447888).

Almost surely, 2^21020300224 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 21020300224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26065081728).

21020300224 is an abundant number, since it is smaller than the sum of its proper divisors (31109863232).

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

21020300224 is a wasteful number, since it uses less digits than its factorization.

21020300224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314 (or 10304 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21020300224 its reverse (42200302012), we get a palindrome (63220602236).

The spelling of 21020300224 in words is "twenty-one billion, twenty million, three hundred thousand, two hundred twenty-four".