21031321100112 has 120 divisors (see below), whose sum is σ = 61967648028000. Its totient is φ = 6640253800704.

The previous prime is 21031321100077. The next prime is 21031321100113. The reversal of 21031321100112 is 21100112313012.

21031321100112 is a `hidden beast` number, since 210 + 31 + 321 + 100 + 1 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031321100113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14300514 + ... + 15702462.

It is an arithmetic number, because the mean of its divisors is an integer number (516397066900).

Almost surely, 2^{21031321100112} 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 21031321100112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30983824014000).

21031321100112 is an abundant number, since it is smaller than the sum of its proper divisors (40936326927888).

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

21031321100112 is a wasteful number, since it uses less digits than its factorization.

21031321100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407465 (or 1407456 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21031321100112 its reverse (21100112313012), we get a palindrome (42131433413124).

The spelling of 21031321100112 in words is "twenty-one trillion, thirty-one billion, three hundred twenty-one million, one hundred thousand, one hundred twelve".