21031100013112 has 96 divisors (see below), whose sum is σ = 47144783800800. Its totient is φ = 8615308787712.

The previous prime is 21031100013071. The next prime is 21031100013197. The reversal of 21031100013112 is 21131000113012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41488288 + ... + 41992144.

It is an arithmetic number, because the mean of its divisors is an integer number (491091497925).

Almost surely, 2^{21031100013112} 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 21031100013112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23572391900400).

21031100013112 is an abundant number, since it is smaller than the sum of its proper divisors (26113683787688).

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

21031100013112 is a wasteful number, since it uses less digits than its factorization.

21031100013112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505325 (or 505298 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21031100013112 its reverse (21131000113012), we get a palindrome (42162100126124).

The spelling of 21031100013112 in words is "twenty-one trillion, thirty-one billion, one hundred million, thirteen thousand, one hundred twelve".