121121042209 has 2 divisors, whose sum is σ = 121121042210. Its totient is φ = 121121042208.

The previous prime is 121121042191. The next prime is 121121042219. The reversal of 121121042209 is 902240121121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110048110225 + 11072931984 = 331735^2 + 105228^2 .

It is a cyclic number.

It is not a de Polignac number, because 121121042209 - 2⁵ = 121121042177 is a prime.

It is not a weakly prime, because it can be changed into another prime (121121042219) 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, 60560521104 + 60560521105.

It is an arithmetic number, because the mean of its divisors is an integer number (60560521105).

Almost surely, 2^121121042209 is an apocalyptic number.

It is an amenable number.

121121042209 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121042209 is an equidigital number, since it uses as much as digits as its factorization.

121121042209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 121121042209 in words is "one hundred twenty-one billion, one hundred twenty-one million, forty-two thousand, two hundred nine".