121101010181 has 2 divisors, whose sum is σ = 121101010182. Its totient is φ = 121101010180.

The previous prime is 121101010159. The next prime is 121101010193. The reversal of 121101010181 is 181010101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117080308900 + 4020701281 = 342170^2 + 63409^2 .

It is a cyclic number.

It is not a de Polignac number, because 121101010181 - 2¹⁰ = 121101009157 is a prime.

It is a super-2 number, since 2×121101010181² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain 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 (121101010781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550505090 + 60550505091.

It is an arithmetic number, because the mean of its divisors is an integer number (60550505091).

Almost surely, 2^121101010181 is an apocalyptic number.

It is an amenable number.

121101010181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121101010181 is an equidigital number, since it uses as much as digits as its factorization.

121101010181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

The spelling of 121101010181 in words is "one hundred twenty-one billion, one hundred one million, ten thousand, one hundred eighty-one".