21094439112 has 72 divisors (see below), whose sum is σ = 58716853650. Its totient is φ = 6841407744.

The previous prime is 21094439111. The next prime is 21094439123. The reversal of 21094439112 is 21193449012.

21094439112 is a `hidden beast` number, since 2 + 109 + 4 + 439 + 112 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 20407265316 + 687173796 = 142854^2 + 26214^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-3 number, since 3×21094439112³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21094439111) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8437 + ... + 205572.

Almost surely, 2^21094439112 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 21094439112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29358426825).

21094439112 is an abundant number, since it is smaller than the sum of its proper divisors (37622414538).

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

21094439112 is a wasteful number, since it uses less digits than its factorization.

21094439112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214095 (or 214051 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 21094439112 in words is "twenty-one billion, ninety-four million, four hundred thirty-nine thousand, one hundred twelve".