21233111112 has 192 divisors, whose sum is σ = 63685440000. Its totient is φ = 6356815872.

The previous prime is 21233111093. The next prime is 21233111147. The reversal of 21233111112 is 21111133212.

21233111112 is a `hidden beast` number, since 212 + 331 + 11 + 112 = 666.

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

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20240764 + ... + 20241812.

It is an arithmetic number, because the mean of its divisors is an integer number (331695000).

Almost surely, 2^21233111112 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 21233111112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31842720000).

21233111112 is an abundant number, since it is smaller than the sum of its proper divisors (42452328888).

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

21233111112 is a wasteful number, since it uses less digits than its factorization.

21233111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1813 counting only the distinct ones).

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

Adding to 21233111112 its reverse (21111133212), we get a palindrome (42344244324).

The spelling of 21233111112 in words is "twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, one hundred twelve".