1200011120001 has 12 divisors (see below), whose sum is σ = 1780196677012. Its totient is φ = 778385591136.

The previous prime is 1200011119877. The next prime is 1200011120027. The reversal of 1200011120001 is 1000211100021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1006410240000 + 193600880001 = 1003200^2 + 440001^2 .

It is not a de Polignac number, because 1200011120001 - 2²² = 1200006925697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200011120051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1801818166 + ... + 1801818831.

Almost surely, 2^{1200011120001} is an apocalyptic number.

It is an amenable number.

1200011120001 is a deficient number, since it is larger than the sum of its proper divisors (580185557011).

1200011120001 is a wasteful number, since it uses less digits than its factorization.

1200011120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603637040 (or 3603637037 counting only the distinct ones).

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

Adding to 1200011120001 its reverse (1000211100021), we get a palindrome (2200222220022).

The spelling of 1200011120001 in words is "one trillion, two hundred billion, eleven million, one hundred twenty thousand, one".