1200120111 has 16 divisors (see below), whose sum is σ = 1782319200. Its totient is φ = 798116544.

The previous prime is 1200120109. The next prime is 1200120113. The reversal of 1200120111 is 1110210021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1200120109) and next prime (1200120113).

It is not a de Polignac number, because 1200120111 - 2¹ = 1200120109 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1200120093 and 1200120102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120113) 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, 43296 + ... + 65381.

It is an arithmetic number, because the mean of its divisors is an integer number (111394950).

Almost surely, 2^1200120111 is an apocalyptic number.

1200120111 is a deficient number, since it is larger than the sum of its proper divisors (582199089).

1200120111 is a wasteful number, since it uses less digits than its factorization.

1200120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109095 (or 109089 counting only the distinct ones).

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

The square root of 1200120111 is about 34642.7497609529. The cubic root of 1200120111 is about 1062.6940227174.

Adding to 1200120111 its reverse (1110210021), we get a palindrome (2310330132).

The spelling of 1200120111 in words is "one billion, two hundred million, one hundred twenty thousand, one hundred eleven".