121221222002009 has 2 divisors, whose sum is σ = 121221222002010. Its totient is φ = 121221222002008.

The previous prime is 121221222001973. The next prime is 121221222002051. The reversal of 121221222002009 is 900200222122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99106803457600 + 22114418544409 = 9955240^2 + 4702597^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221222002009 - 2⁴⁰ = 120121710374233 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221222302009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610611001004 + 60610611001005.

It is an arithmetic number, because the mean of its divisors is an integer number (60610611001005).

Almost surely, 2^{121221222002009} is an apocalyptic number.

It is an amenable number.

121221222002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221222002009 is an equidigital number, since it uses as much as digits as its factorization.

121221222002009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 121221222002009 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, nine".