43121042040 has 64 divisors (see below), whose sum is σ = 129395957760. Its totient is φ = 11496026240.

The previous prime is 43121042039. The next prime is 43121042047. The reversal of 43121042040 is 4024012134.

It is a junction number, because it is equal to n+sod(n) for n = 43121041998 and 43121042016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121042047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451705 + ... + 538775.

It is an arithmetic number, because the mean of its divisors is an integer number (2021811840).

Almost surely, 2^43121042040 is an apocalyptic number.

43121042040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43121042040 is an abundant number, since it is smaller than the sum of its proper divisors (86274915720).

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

43121042040 is a wasteful number, since it uses less digits than its factorization.

43121042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91212 (or 91208 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 43121042040 its reverse (4024012134), we get a palindrome (47145054174).

The spelling of 43121042040 in words is "forty-three billion, one hundred twenty-one million, forty-two thousand, forty".