21130020112 has 80 divisors (see below), whose sum is σ = 43349796864. Its totient is φ = 9962496000.

The previous prime is 21130020091. The next prime is 21130020113. The reversal of 21130020112 is 21102003112.

It is a junction number, because it is equal to n+sod(n) for n = 21130020092 and 21130020101.

It is not an unprimeable number, because it can be changed into a prime (21130020113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5616312 + ... + 5620072.

Almost surely, 2^21130020112 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 21130020112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21674898432).

21130020112 is an abundant number, since it is smaller than the sum of its proper divisors (22219776752).

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

21130020112 is a wasteful number, since it uses less digits than its factorization.

21130020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088 (or 4082 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21130020112 its reverse (21102003112), we get a palindrome (42232023224).

The spelling of 21130020112 in words is "twenty-one billion, one hundred thirty million, twenty thousand, one hundred twelve".