1201111121 has 16 divisors (see below), whose sum is σ = 1394174208. Its totient is φ = 1013472000.

The previous prime is 1201111117. The next prime is 1201111123. The reversal of 1201111121 is 1211111021.

It is a cyclic number.

It is not a de Polignac number, because 1201111121 - 2² = 1201111117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201111123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305156 + ... + 309066.

It is an arithmetic number, because the mean of its divisors is an integer number (87135888).

Almost surely, 2^1201111121 is an apocalyptic number.

It is an amenable number.

1201111121 is a deficient number, since it is larger than the sum of its proper divisors (193063087).

1201111121 is an equidigital number, since it uses as much as digits as its factorization.

1201111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592.

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

The square root of 1201111121 is about 34657.0500908545. The cubic root of 1201111121 is about 1062.9864519630.

Adding to 1201111121 its reverse (1211111021), we get a palindrome (2412222142).

It can be divided in two parts, 12011 and 11121, that added together give a palindrome (23132).

The spelling of 1201111121 in words is "one billion, two hundred one million, one hundred eleven thousand, one hundred twenty-one".