121211220121009 has 2 divisors, whose sum is σ = 121211220121010. Its totient is φ = 121211220121008.

The previous prime is 121211220121003. The next prime is 121211220121027. The reversal of 121211220121009 is 900121022112121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93298753720384 + 27912466400625 = 9659128^2 + 5283225^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211220121009 - 2³¹ = 121209072637361 is a prime.

It is not a weakly prime, because it can be changed into another prime (121211220121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605610060504 + 60605610060505.

It is an arithmetic number, because the mean of its divisors is an integer number (60605610060505).

Almost surely, 2^{121211220121009} is an apocalyptic number.

It is an amenable number.

121211220121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211220121009 is an equidigital number, since it uses as much as digits as its factorization.

121211220121009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 121211220121009 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, nine".