121020002009 has 2 divisors, whose sum is σ = 121020002010. Its totient is φ = 121020002008.

The previous prime is 121020001957. The next prime is 121020002021. The reversal of 121020002009 is 900200020121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78272371984 + 42747630025 = 279772^2 + 206755^2 .

It is an emirp because it is prime and its reverse (900200020121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121020002009 is a prime.

It is not a weakly prime, because it can be changed into another prime (121020022009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510001004 + 60510001005.

It is an arithmetic number, because the mean of its divisors is an integer number (60510001005).

Almost surely, 2^121020002009 is an apocalyptic number.

It is an amenable number.

121020002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020002009 is an equidigital number, since it uses as much as digits as its factorization.

121020002009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 121020002009 in words is "one hundred twenty-one billion, twenty million, two thousand, nine".