1200012100109 has 2 divisors, whose sum is σ = 1200012100110. Its totient is φ = 1200012100108.

The previous prime is 1200012100097. The next prime is 1200012100247. The reversal of 1200012100109 is 9010012100021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661909162084 + 538102938025 = 813578^2 + 733555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200012100109 - 2⁴⁰ = 100500472333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200012100009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600006050054 + 600006050055.

It is an arithmetic number, because the mean of its divisors is an integer number (600006050055).

Almost surely, 2^{1200012100109} is an apocalyptic number.

It is an amenable number.

1200012100109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200012100109 is an equidigital number, since it uses as much as digits as its factorization.

1200012100109 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 17.

The spelling of 1200012100109 in words is "one trillion, two hundred billion, twelve million, one hundred thousand, one hundred nine".