1200100002173 has 2 divisors, whose sum is σ = 1200100002174. Its totient is φ = 1200100002172.

The previous prime is 1200100002163. The next prime is 1200100002239. The reversal of 1200100002173 is 3712000010021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1138450588324 + 61649413849 = 1066982^2 + 248293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200100002173 - 2⁸ = 1200100001917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200100002163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600050001086 + 600050001087.

It is an arithmetic number, because the mean of its divisors is an integer number (600050001087).

Almost surely, 2^{1200100002173} is an apocalyptic number.

It is an amenable number.

1200100002173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100002173 is an equidigital number, since it uses as much as digits as its factorization.

1200100002173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

Adding to 1200100002173 its reverse (3712000010021), we get a palindrome (4912100012194).

The spelling of 1200100002173 in words is "one trillion, two hundred billion, one hundred million, two thousand, one hundred seventy-three".