120121009 has 2 divisors, whose sum is σ = 120121010. Its totient is φ = 120121008.

The previous prime is 120120967. The next prime is 120121013. The reversal of 120121009 is 900121021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95121009 + 25000000 = 9753^2 + 5000^2 .

It is a cyclic number.

It is not a de Polignac number, because 120121009 - 2¹¹ = 120118961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120120983 and 120121001.

It is not a weakly prime, because it can be changed into another prime (120121039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060504 + 60060505.

It is an arithmetic number, because the mean of its divisors is an integer number (60060505).

Almost surely, 2^120121009 is an apocalyptic number.

It is an amenable number.

120121009 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121009 is an equidigital number, since it uses as much as digits as its factorization.

120121009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 120121009 is about 10959.9730382880. The cubic root of 120121009 is about 493.4081557542.

The spelling of 120121009 in words is "one hundred twenty million, one hundred twenty-one thousand, nine".