121210010609 has 2 divisors, whose sum is σ = 121210010610. Its totient is φ = 121210010608.

The previous prime is 121210010569. The next prime is 121210010653. The reversal of 121210010609 is 906010012121.

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., 113011613584 + 8198397025 = 336172^2 + 90545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210010609 is a prime.

It is not a weakly prime, because it can be changed into another prime (121210010809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605005304 + 60605005305.

It is an arithmetic number, because the mean of its divisors is an integer number (60605005305).

Almost surely, 2^121210010609 is an apocalyptic number.

It is an amenable number.

121210010609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210010609 is an equidigital number, since it uses as much as digits as its factorization.

121210010609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 121210010609 in words is "one hundred twenty-one billion, two hundred ten million, ten thousand, six hundred nine".