121112020181 has 2 divisors, whose sum is σ = 121112020182. Its totient is φ = 121112020180.

The previous prime is 121112020121. The next prime is 121112020193. The reversal of 121112020181 is 181020211121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113731492081 + 7380528100 = 337241^2 + 85910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121112020181 is a prime.

It is a super-2 number, since 2×121112020181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121112020121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556010090 + 60556010091.

It is an arithmetic number, because the mean of its divisors is an integer number (60556010091).

Almost surely, 2^121112020181 is an apocalyptic number.

It is an amenable number.

121112020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112020181 is an equidigital number, since it uses as much as digits as its factorization.

121112020181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 121112020181 in words is "one hundred twenty-one billion, one hundred twelve million, twenty thousand, one hundred eighty-one".