1200121110111 has 128 divisors (see below), whose sum is σ = 2050237587456. Its totient is φ = 606475745280.

The previous prime is 1200121110101. The next prime is 1200121110127. The reversal of 1200121110111 is 1110111210021.

It is not a de Polignac number, because 1200121110111 - 2⁶ = 1200121110047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121110101) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 376566060 + ... + 376569246.

It is an arithmetic number, because the mean of its divisors is an integer number (16017481152).

Almost surely, 2^{1200121110111} is an apocalyptic number.

1200121110111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200121110111 is a deficient number, since it is larger than the sum of its proper divisors (850116477345).

1200121110111 is a wasteful number, since it uses less digits than its factorization.

1200121110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1200121110111 its reverse (1110111210021), we get a palindrome (2310232320132).

It can be divided in two parts, 12001 and 21110111, that added together give a palindrome (21122112).

The spelling of 1200121110111 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred ten thousand, one hundred eleven".