43800040121 has 2 divisors, whose sum is σ = 43800040122. Its totient is φ = 43800040120.

The previous prime is 43800040117. The next prime is 43800040169. The reversal of 43800040121 is 12104000834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43712355625 + 87684496 = 209075^2 + 9364^2 .

It is a cyclic number.

It is not a de Polignac number, because 43800040121 - 2² = 43800040117 is a prime.

It is not a weakly prime, because it can be changed into another prime (43800040621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21900020060 + 21900020061.

It is an arithmetic number, because the mean of its divisors is an integer number (21900020061).

Almost surely, 2^43800040121 is an apocalyptic number.

It is an amenable number.

43800040121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43800040121 is an equidigital number, since it uses as much as digits as its factorization.

43800040121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 43800040121 its reverse (12104000834), we get a palindrome (55904040955).

The spelling of 43800040121 in words is "forty-three billion, eight hundred million, forty thousand, one hundred twenty-one".