21030113020 has 144 divisors (see below), whose sum is σ = 54345791808. Its totient is φ = 6801822720.

The previous prime is 21030113017. The next prime is 21030113029. The reversal of 21030113020 is 2031103012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030113029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1639030 + ... + 1651810.

It is an arithmetic number, because the mean of its divisors is an integer number (377401332).

Almost surely, 2^21030113020 is an apocalyptic number.

21030113020 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 21030113020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27172895904).

21030113020 is an abundant number, since it is smaller than the sum of its proper divisors (33315678788).

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

21030113020 is a wasteful number, since it uses less digits than its factorization.

21030113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12900 (or 12891 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21030113020 its reverse (2031103012), we get a palindrome (23061216032).

The spelling of 21030113020 in words is "twenty-one billion, thirty million, one hundred thirteen thousand, twenty".