1111200121 has 4 divisors (see below), whose sum is σ = 1176564852. Its totient is φ = 1045835392.

The previous prime is 1111200113. The next prime is 1111200133. The reversal of 1111200121 is 1210021111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 508006521 + 603193600 = 22539^2 + 24560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111200121 - 2³ = 1111200113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111200098 and 1111200107.

It is not an unprimeable number, because it can be changed into a prime (1111200191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32682340 + ... + 32682373.

It is an arithmetic number, because the mean of its divisors is an integer number (294141213).

Almost surely, 2^1111200121 is an apocalyptic number.

It is an amenable number.

1111200121 is a deficient number, since it is larger than the sum of its proper divisors (65364731).

1111200121 is an equidigital number, since it uses as much as digits as its factorization.

1111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65364730.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1111200121 is about 33334.6684549284. The cubic root of 1111200121 is about 1035.7718253548.

Adding to 1111200121 its reverse (1210021111), we get a palindrome (2321221232).

The spelling of 1111200121 in words is "one billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".