121221181 has 2 divisors, whose sum is σ = 121221182. Its totient is φ = 121221180.

The previous prime is 121221179. The next prime is 121221209. The reversal of 121221181 is 181122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 53158681 = 8250^2 + 7291^2 .

It is an emirp because it is prime and its reverse (181122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221181 - 2¹ = 121221179 is a prime.

It is a super-2 number, since 2×121221181² = 29389149446069522, which contains 22 as substring.

Together with 121221179, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610590 + 60610591.

It is an arithmetic number, because the mean of its divisors is an integer number (60610591).

Almost surely, 2^121221181 is an apocalyptic number.

It is an amenable number.

121221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221181 is an equidigital number, since it uses as much as digits as its factorization.

121221181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 19.

The square root of 121221181 is about 11010.0490916253. The cubic root of 121221181 is about 494.9099329379.

It can be divided in two parts, 1212211 and 81, that multiplied together give a triangular number (98189091 = T₁₄₀₁₃).

The spelling of 121221181 in words is "one hundred twenty-one million, two hundred twenty-one thousand, one hundred eighty-one".