42078321121 has 2 divisors, whose sum is σ = 42078321122. Its totient is φ = 42078321120.

The previous prime is 42078321113. The next prime is 42078321133. The reversal of 42078321121 is 12112387024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42051654225 + 26666896 = 205065^2 + 5164^2 .

It is a cyclic number.

It is not a de Polignac number, because 42078321121 - 2³ = 42078321113 is a prime.

It is not a weakly prime, because it can be changed into another prime (42078321161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21039160560 + 21039160561.

It is an arithmetic number, because the mean of its divisors is an integer number (21039160561).

Almost surely, 2^42078321121 is an apocalyptic number.

It is an amenable number.

42078321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42078321121 is an equidigital number, since it uses as much as digits as its factorization.

42078321121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 42078321121 in words is "forty-two billion, seventy-eight million, three hundred twenty-one thousand, one hundred twenty-one".