121233312181 has 2 divisors, whose sum is σ = 121233312182. Its totient is φ = 121233312180.

The previous prime is 121233312121. The next prime is 121233312223. The reversal of 121233312181 is 181213332121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119999195281 + 1234116900 = 346409^2 + 35130^2 .

It is a cyclic number.

It is not a de Polignac number, because 121233312181 - 2⁹ = 121233311669 is a prime.

It is a super-2 number, since 2×121233312181² (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 (121233312121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60616656090 + 60616656091.

It is an arithmetic number, because the mean of its divisors is an integer number (60616656091).

Almost surely, 2^121233312181 is an apocalyptic number.

It is an amenable number.

121233312181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121233312181 is an equidigital number, since it uses as much as digits as its factorization.

121233312181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The spelling of 121233312181 in words is "one hundred twenty-one billion, two hundred thirty-three million, three hundred twelve thousand, one hundred eighty-one".