1200110121 has 32 divisors (see below), whose sum is σ = 2151463680. Its totient is φ = 645435648.

The previous prime is 1200110117. The next prime is 1200110137. The reversal of 1200110121 is 1210110021.

It is a happy number.

It is not a de Polignac number, because 1200110121 - 2² = 1200110117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1200110141) 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 31 ways as a sum of consecutive naturals, for example, 183546 + ... + 189971.

It is an arithmetic number, because the mean of its divisors is an integer number (67233240).

Almost surely, 2^1200110121 is an apocalyptic number.

It is an amenable number.

1200110121 is a deficient number, since it is larger than the sum of its proper divisors (951353559).

1200110121 is a wasteful number, since it uses less digits than its factorization.

1200110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373550 (or 373544 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1200110121 is about 34642.6055746389. The cubic root of 1200110121 is about 1062.6910740284.

Adding to 1200110121 its reverse (1210110021), we get a palindrome (2410220142).

It can be divided in two parts, 12001 and 10121, that added together give a palindrome (22122).

The spelling of 1200110121 in words is "one billion, two hundred million, one hundred ten thousand, one hundred twenty-one".