42043131121 has 2 divisors, whose sum is σ = 42043131122. Its totient is φ = 42043131120.

The previous prime is 42043131101. The next prime is 42043131131. The reversal of 42043131121 is 12113134024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37137529521 + 4905601600 = 192711^2 + 70040^2 .

It is a cyclic number.

It is not a de Polignac number, because 42043131121 - 2⁷ = 42043130993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42043131092 and 42043131101.

It is not a weakly prime, because it can be changed into another prime (42043131101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021565560 + 21021565561.

It is an arithmetic number, because the mean of its divisors is an integer number (21021565561).

Almost surely, 2^42043131121 is an apocalyptic number.

It is an amenable number.

42043131121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043131121 is an equidigital number, since it uses as much as digits as its factorization.

42043131121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 42043131121 its reverse (12113134024), we get a palindrome (54156265145).

The spelling of 42043131121 in words is "forty-two billion, forty-three million, one hundred thirty-one thousand, one hundred twenty-one".