43042040123 has 2 divisors, whose sum is σ = 43042040124. Its totient is φ = 43042040122.

The previous prime is 43042039991. The next prime is 43042040131. The reversal of 43042040123 is 32104024034.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43042040123 - 2¹⁰ = 43042039099 is a prime.

It is not a weakly prime, because it can be changed into another prime (43042040143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21521020061 + 21521020062.

It is an arithmetic number, because the mean of its divisors is an integer number (21521020062).

Almost surely, 2^43042040123 is an apocalyptic number.

43042040123 is a deficient number, since it is larger than the sum of its proper divisors (1).

43042040123 is an equidigital number, since it uses as much as digits as its factorization.

43042040123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 43042040123 its reverse (32104024034), we get a palindrome (75146064157).

The spelling of 43042040123 in words is "forty-three billion, forty-two million, forty thousand, one hundred twenty-three".