21021231321112 has 192 divisors, whose sum is σ = 45997358400000. Its totient is φ = 8974294560000.

The previous prime is 21021231321049. The next prime is 21021231321119. The reversal of 21021231321112 is 21112313212012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021231321119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1919917014 + ... + 1919927962.

It is an arithmetic number, because the mean of its divisors is an integer number (239569575000).

Almost surely, 2^{21021231321112} is an apocalyptic number.

21021231321112 is a gapful number since it is divisible by the number (22) 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 21021231321112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22998679200000).

21021231321112 is an abundant number, since it is smaller than the sum of its proper divisors (24976127078888).

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

21021231321112 is a wasteful number, since it uses less digits than its factorization.

21021231321112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886 (or 11871 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21021231321112 its reverse (21112313212012), we get a palindrome (42133544533124).

The spelling of 21021231321112 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-one million, three hundred twenty-one thousand, one hundred twelve".