121100442181 has 2 divisors, whose sum is σ = 121100442182. Its totient is φ = 121100442180.

The previous prime is 121100442173. The next prime is 121100442209. The reversal of 121100442181 is 181244001121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112885920225 + 8214521956 = 335985^2 + 90634^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100442181 - 2³ = 121100442173 is a prime.

It is a super-2 number, since 2×121100442181² (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 (121100442581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550221090 + 60550221091.

It is an arithmetic number, because the mean of its divisors is an integer number (60550221091).

Almost surely, 2^121100442181 is an apocalyptic number.

It is an amenable number.

121100442181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100442181 is an equidigital number, since it uses as much as digits as its factorization.

121100442181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 25.

The spelling of 121100442181 in words is "one hundred twenty-one billion, one hundred million, four hundred forty-two thousand, one hundred eighty-one".