11111200121 has 16 divisors (see below), whose sum is σ = 13017449088. Its totient is φ = 9285014400.

The previous prime is 11111200117. The next prime is 11111200147. The reversal of 11111200121 is 12100211111.

It is a cyclic number.

It is not a de Polignac number, because 11111200121 - 2² = 11111200117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11111200151) 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 15 ways as a sum of consecutive naturals, for example, 415526 + ... + 441456.

It is an arithmetic number, because the mean of its divisors is an integer number (813590568).

Almost surely, 2^11111200121 is an apocalyptic number.

It is an amenable number.

11111200121 is a deficient number, since it is larger than the sum of its proper divisors (1906248967).

11111200121 is a wasteful number, since it uses less digits than its factorization.

11111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27472.

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

Adding to 11111200121 its reverse (12100211111), we get a palindrome (23211411232).

The spelling of 11111200121 in words is "eleven billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".