43121832138 has 120 divisors (see below), whose sum is σ = 121380358176. Its totient is φ = 11200440240.

The previous prime is 43121832079. The next prime is 43121832161. The reversal of 43121832138 is 83123812134.

43121832138 is a `hidden beast` number, since 4 + 312 + 18 + 321 + 3 + 8 = 666.

It is a super-3 number, since 3×43121832138³ (a number of 33 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 19920 + ... + 294347.

Almost surely, 2^43121832138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43121832138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60690179088).

43121832138 is an abundant number, since it is smaller than the sum of its proper divisors (78258526038).

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

43121832138 is a wasteful number, since it uses less digits than its factorization.

43121832138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314310 (or 314290 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The spelling of 43121832138 in words is "forty-three billion, one hundred twenty-one million, eight hundred thirty-two thousand, one hundred thirty-eight".