21134018178 has 192 divisors, whose sum is σ = 59544979200. Its totient is φ = 5437186560.

The previous prime is 21134018083. The next prime is 21134018189. The reversal of 21134018178 is 87181043112.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2615128 + ... + 2623196.

It is an arithmetic number, because the mean of its divisors is an integer number (310130100).

Almost surely, 2^21134018178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134018178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29772489600).

21134018178 is an abundant number, since it is smaller than the sum of its proper divisors (38410961022).

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

21134018178 is a wasteful number, since it uses less digits than its factorization.

21134018178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154 (or 8135 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 21134018178 in words is "twenty-one billion, one hundred thirty-four million, eighteen thousand, one hundred seventy-eight".