1200111002001 has 6 divisors (see below), whose sum is σ = 1733493669570. Its totient is φ = 800074001328.

The previous prime is 1200111001981. The next prime is 1200111002003. The reversal of 1200111002001 is 1002001110021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 900223337601 + 299887664400 = 948801^2 + 547620^2 .

It is not a de Polignac number, because 1200111002001 - 2¹⁷ = 1200110870929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 133345666889 = 1200111002001 / (1 + 2 + 0 + 0 + 1 + 1 + 1 + 0 + 0 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1200111002003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66672833436 + ... + 66672833453.

It is an arithmetic number, because the mean of its divisors is an integer number (288915611595).

Almost surely, 2^{1200111002001} is an apocalyptic number.

It is an amenable number.

1200111002001 is a deficient number, since it is larger than the sum of its proper divisors (533382667569).

1200111002001 is a wasteful number, since it uses less digits than its factorization.

1200111002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133345666895 (or 133345666892 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1200111002001 its reverse (1002001110021), we get a palindrome (2202112112022).

The spelling of 1200111002001 in words is "one trillion, two hundred billion, one hundred eleven million, two thousand, one".