1200001121111 has 32 divisors (see below), whose sum is σ = 1352143134720. Its totient is φ = 1057919990400.

The previous prime is 1200001121083. The next prime is 1200001121113. The reversal of 1200001121111 is 1111211000021.

It is a de Polignac number, because none of the positive numbers 2^k-1200001121111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200001121092 and 1200001121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001121113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3709346 + ... + 4019856.

It is an arithmetic number, because the mean of its divisors is an integer number (42254472960).

Almost surely, 2^{1200001121111} is an apocalyptic number.

1200001121111 is a deficient number, since it is larger than the sum of its proper divisors (152142013609).

1200001121111 is a wasteful number, since it uses less digits than its factorization.

1200001121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310727.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1200001121111 its reverse (1111211000021), we get a palindrome (2311212121132).

The spelling of 1200001121111 in words is "one trillion, two hundred billion, one million, one hundred twenty-one thousand, one hundred eleven".