1200111122121 has 16 divisors (see below), whose sum is σ = 1666541835648. Its totient is φ = 767486361600.

The previous prime is 1200111122117. The next prime is 1200111122141. The reversal of 1200111122121 is 1212211110021.

It is a happy number.

It is not a de Polignac number, because 1200111122121 - 2² = 1200111122117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200111122121.

It is not an unprimeable number, because it can be changed into a prime (1200111122141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76131640 + ... + 76147401.

It is an arithmetic number, because the mean of its divisors is an integer number (104158864728).

Almost surely, 2^{1200111122121} is an apocalyptic number.

It is an amenable number.

1200111122121 is a deficient number, since it is larger than the sum of its proper divisors (466430713527).

1200111122121 is a wasteful number, since it uses less digits than its factorization.

1200111122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152279152.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1200111122121 its reverse (1212211110021), we get a palindrome (2412322232142).

The spelling of 1200111122121 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".