42020340181 has 2 divisors, whose sum is σ = 42020340182. Its totient is φ = 42020340180.

The previous prime is 42020340161. The next prime is 42020340209. The reversal of 42020340181 is 18104302024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33565537681 + 8454802500 = 183209^2 + 91950^2 .

It is a cyclic number.

It is not a de Polignac number, because 42020340181 - 2³⁵ = 7660601813 is a prime.

It is a super-2 number, since 2×42020340181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42020340161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010170090 + 21010170091.

It is an arithmetic number, because the mean of its divisors is an integer number (21010170091).

Almost surely, 2^42020340181 is an apocalyptic number.

It is an amenable number.

42020340181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020340181 is an equidigital number, since it uses as much as digits as its factorization.

42020340181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 42020340181 in words is "forty-two billion, twenty million, three hundred forty thousand, one hundred eighty-one".