121000010009 has 2 divisors, whose sum is σ = 121000010010. Its totient is φ = 121000010008.

The previous prime is 121000009997. The next prime is 121000010029. The reversal of 121000010009 is 900010000121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108469446409 + 12530563600 = 329347^2 + 111940^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000010009 - 2²⁴ = 120983232793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121000009975 and 121000010002.

It is not a weakly prime, because it can be changed into another prime (121000010029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500005004 + 60500005005.

It is an arithmetic number, because the mean of its divisors is an integer number (60500005005).

Almost surely, 2^121000010009 is an apocalyptic number.

It is an amenable number.

121000010009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000010009 is an equidigital number, since it uses as much as digits as its factorization.

121000010009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 121000010009 in words is "one hundred twenty-one billion, ten thousand, nine".