21110831112 has 192 divisors, whose sum is σ = 63678320640. Its totient is φ = 5809104000.

The previous prime is 21110831099. The next prime is 21110831113. The reversal of 21110831112 is 21113801112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21110831113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8274237 + ... + 8276787.

It is an arithmetic number, because the mean of its divisors is an integer number (331657920).

Almost surely, 2^21110831112 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 21110831112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31839160320).

21110831112 is an abundant number, since it is smaller than the sum of its proper divisors (42567489528).

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

21110831112 is a wasteful number, since it uses less digits than its factorization.

21110831112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832 (or 2821 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 21.

The spelling of 21110831112 in words is "twenty-one billion, one hundred ten million, eight hundred thirty-one thousand, one hundred twelve".