43123121040 has 160 divisors (see below), whose sum is σ = 140128281216. Its totient is φ = 10958008320.

The previous prime is 43123121021. The next prime is 43123121047. The reversal of 43123121040 is 4012132134.

It is a junction number, because it is equal to n+sod(n) for n = 43123120998 and 43123121016.

It is not an unprimeable number, because it can be changed into a prime (43123121047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372162 + ... + 474078.

Almost surely, 2^43123121040 is an apocalyptic number.

43123121040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43123121040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70064140608).

43123121040 is an abundant number, since it is smaller than the sum of its proper divisors (97005160176).

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

43123121040 is a wasteful number, since it uses less digits than its factorization.

43123121040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102017 (or 102011 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 43123121040 its reverse (4012132134), we get a palindrome (47135253174).

The spelling of 43123121040 in words is "forty-three billion, one hundred twenty-three million, one hundred twenty-one thousand, forty".