21030131112 has 128 divisors (see below), whose sum is σ = 56736028800. Its totient is φ = 6472294400.

The previous prime is 21030131071. The next prime is 21030131113. The reversal of 21030131112 is 21113103012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21030131091 and 21030131100.

It is not an unprimeable number, because it can be changed into a prime (21030131113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4754662 + ... + 4759082.

It is an arithmetic number, because the mean of its divisors is an integer number (443250225).

Almost surely, 2^21030131112 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 21030131112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28368014400).

21030131112 is an abundant number, since it is smaller than the sum of its proper divisors (35705897688).

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

21030131112 is a wasteful number, since it uses less digits than its factorization.

21030131112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667 (or 4663 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21030131112 its reverse (21113103012), we get a palindrome (42143234124).

The spelling of 21030131112 in words is "twenty-one billion, thirty million, one hundred thirty-one thousand, one hundred twelve".