121200211609 has 2 divisors, whose sum is σ = 121200211610. Its totient is φ = 121200211608.

The previous prime is 121200211567. The next prime is 121200211679. The reversal of 121200211609 is 906112002121.

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., 106535001609 + 14665210000 = 326397^2 + 121100^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200211609 - 2¹⁹ = 121199687321 is a prime.

It is not a weakly prime, because it can be changed into another prime (121200211679) 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, 60600105804 + 60600105805.

It is an arithmetic number, because the mean of its divisors is an integer number (60600105805).

Almost surely, 2^121200211609 is an apocalyptic number.

It is an amenable number.

121200211609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200211609 is an equidigital number, since it uses as much as digits as its factorization.

121200211609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 121200211609 in words is "one hundred twenty-one billion, two hundred million, two hundred eleven thousand, six hundred nine".