21103300020 has 192 divisors, whose sum is σ = 67047321600. Its totient is φ = 4914224640.

The previous prime is 21103299991. The next prime is 21103300033. The reversal of 21103300020 is 2000330112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21103299969 and 21103300005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1923711 + ... + 1934649.

It is an arithmetic number, because the mean of its divisors is an integer number (349204800).

Almost surely, 2^21103300020 is an apocalyptic number.

21103300020 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 21103300020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33523660800).

21103300020 is an abundant number, since it is smaller than the sum of its proper divisors (45944021580).

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

21103300020 is a wasteful number, since it uses less digits than its factorization.

21103300020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11078 (or 11076 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21103300020 its reverse (2000330112), we get a palindrome (23103630132).

It can be divided in two parts, 21103 and 300020, that added together give a palindrome (321123).

The spelling of 21103300020 in words is "twenty-one billion, one hundred three million, three hundred thousand, twenty".