42111121729 has 2 divisors, whose sum is σ = 42111121730. Its totient is φ = 42111121728.

The previous prime is 42111121727. The next prime is 42111121747. The reversal of 42111121729 is 92712111124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30189757504 + 11921364225 = 173752^2 + 109185^2 .

It is a cyclic number.

It is not a de Polignac number, because 42111121729 - 2¹ = 42111121727 is a prime.

Together with 42111121727, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42111121729.

It is not a weakly prime, because it can be changed into another prime (42111121721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21055560864 + 21055560865.

It is an arithmetic number, because the mean of its divisors is an integer number (21055560865).

Almost surely, 2^42111121729 is an apocalyptic number.

It is an amenable number.

42111121729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42111121729 is an equidigital number, since it uses as much as digits as its factorization.

42111121729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The spelling of 42111121729 in words is "forty-two billion, one hundred eleven million, one hundred twenty-one thousand, seven hundred twenty-nine".