42121101181 has 2 divisors, whose sum is σ = 42121101182. Its totient is φ = 42121101180.

The previous prime is 42121101173. The next prime is 42121101241. The reversal of 42121101181 is 18110112124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22340085156 + 19781016025 = 149466^2 + 140645^2 .

It is a cyclic number.

It is not a de Polignac number, because 42121101181 - 2³ = 42121101173 is a prime.

It is a super-2 number, since 2×42121101181² (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 (42121108181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060550590 + 21060550591.

It is an arithmetic number, because the mean of its divisors is an integer number (21060550591).

Almost surely, 2^42121101181 is an apocalyptic number.

It is an amenable number.

42121101181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121101181 is an equidigital number, since it uses as much as digits as its factorization.

42121101181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 42121101181 in words is "forty-two billion, one hundred twenty-one million, one hundred one thousand, one hundred eighty-one".