21179138112 has 84 divisors (see below), whose sum is σ = 66224938416. Its totient is φ = 6417918720.

The previous prime is 21179138089. The next prime is 21179138117. The reversal of 21179138112 is 21183197112.

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 (21179138117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1664998 + ... + 1677669.

It is an arithmetic number, because the mean of its divisors is an integer number (788392124).

Almost surely, 2^21179138112 is an apocalyptic number.

21179138112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21179138112 is an abundant number, since it is smaller than the sum of its proper divisors (45045800304).

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

21179138112 is a wasteful number, since it uses less digits than its factorization.

21179138112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342696 (or 3342683 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The spelling of 21179138112 in words is "twenty-one billion, one hundred seventy-nine million, one hundred thirty-eight thousand, one hundred twelve".