43121404065 has 32 divisors (see below), whose sum is σ = 72011255040. Its totient is φ = 21992892416.

The previous prime is 43121404063. The next prime is 43121404097. The reversal of 43121404065 is 56040412134.

It is a cyclic number.

It is not a de Polignac number, because 43121404065 - 2¹ = 43121404063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43121404063) 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, 1715629 + ... + 1740581.

It is an arithmetic number, because the mean of its divisors is an integer number (2250351720).

Almost surely, 2^43121404065 is an apocalyptic number.

It is an amenable number.

43121404065 is a deficient number, since it is larger than the sum of its proper divisors (28889850975).

43121404065 is a wasteful number, since it uses less digits than its factorization.

43121404065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29993.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 43121404065 its reverse (56040412134), we get a palindrome (99161816199).

The spelling of 43121404065 in words is "forty-three billion, one hundred twenty-one million, four hundred four thousand, sixty-five".