121997269181 has 2 divisors, whose sum is σ = 121997269182. Its totient is φ = 121997269180.

The previous prime is 121997269169. The next prime is 121997269189. The reversal of 121997269181 is 181962799121.

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., 94319623225 + 27677645956 = 307115^2 + 166366^2 .

It is a cyclic number.

It is not a de Polignac number, because 121997269181 - 2⁶ = 121997269117 is a prime.

It is a super-2 number, since 2×121997269181² (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 (121997269189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60998634590 + 60998634591.

It is an arithmetic number, because the mean of its divisors is an integer number (60998634591).

Almost surely, 2^121997269181 is an apocalyptic number.

It is an amenable number.

121997269181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121997269181 is an equidigital number, since it uses as much as digits as its factorization.

121997269181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 56.

The spelling of 121997269181 in words is "one hundred twenty-one billion, nine hundred ninety-seven million, two hundred sixty-nine thousand, one hundred eighty-one".