42102169181 has 2 divisors, whose sum is σ = 42102169182. Its totient is φ = 42102169180.

The previous prime is 42102169177. The next prime is 42102169183. The reversal of 42102169181 is 18196120124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41172468100 + 929701081 = 202910^2 + 30491^2 .

It is a cyclic number.

It is not a de Polignac number, because 42102169181 - 2² = 42102169177 is a prime.

It is a super-2 number, since 2×42102169181² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 42102169183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42102169183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21051084590 + 21051084591.

It is an arithmetic number, because the mean of its divisors is an integer number (21051084591).

Almost surely, 2^42102169181 is an apocalyptic number.

It is an amenable number.

42102169181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42102169181 is an equidigital number, since it uses as much as digits as its factorization.

42102169181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 42102169181 in words is "forty-two billion, one hundred two million, one hundred sixty-nine thousand, one hundred eighty-one".