1200120011111 has 12 divisors (see below), whose sum is σ = 1420491978672. Its totient is φ = 993202762944.

The previous prime is 1200120011081. The next prime is 1200120011117. The reversal of 1200120011111 is 1111100210021.

It is a de Polignac number, because none of the positive numbers 2^k-1200120011111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200120011092 and 1200120011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120011117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101923790 + ... + 101935563.

It is an arithmetic number, because the mean of its divisors is an integer number (118374331556).

Almost surely, 2^{1200120011111} is an apocalyptic number.

1200120011111 is a deficient number, since it is larger than the sum of its proper divisors (220371967561).

1200120011111 is an equidigital number, since it uses as much as digits as its factorization.

1200120011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203859418 (or 203859389 counting only the distinct ones).

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

Adding to 1200120011111 its reverse (1111100210021), we get a palindrome (2311220221132).

The spelling of 1200120011111 in words is "one trillion, two hundred billion, one hundred twenty million, eleven thousand, one hundred eleven".