1200120021109 has 2 divisors, whose sum is σ = 1200120021110. Its totient is φ = 1200120021108.

The previous prime is 1200120021049. The next prime is 1200120021157. The reversal of 1200120021109 is 9011200210021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1155420759025 + 44699262084 = 1074905^2 + 211422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200120021109 - 2⁹ = 1200120020597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200120021169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060010554 + 600060010555.

It is an arithmetic number, because the mean of its divisors is an integer number (600060010555).

Almost surely, 2^{1200120021109} is an apocalyptic number.

It is an amenable number.

1200120021109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200120021109 is an equidigital number, since it uses as much as digits as its factorization.

1200120021109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1200120021109 in words is "one trillion, two hundred billion, one hundred twenty million, twenty-one thousand, one hundred nine".