121210181 has 2 divisors, whose sum is σ = 121210182. Its totient is φ = 121210180.

The previous prime is 121210157. The next prime is 121210183. The reversal of 121210181 is 181012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121198081 + 12100 = 11009^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210181 is a prime.

It is a super-2 number, since 2×121210181² = 29383815956105522, which contains 22 as substring.

Together with 121210183, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605090 + 60605091.

It is an arithmetic number, because the mean of its divisors is an integer number (60605091).

Almost surely, 2^121210181 is an apocalyptic number.

It is an amenable number.

121210181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210181 is an equidigital number, since it uses as much as digits as its factorization.

121210181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 121210181 is about 11009.5495366523. The cubic root of 121210181 is about 494.8949625785.

The spelling of 121210181 in words is "one hundred twenty-one million, two hundred ten thousand, one hundred eighty-one".