1200121200 has 90 divisors (see below), whose sum is σ = 4164766424. Its totient is φ = 320031360.

The previous prime is 1200121157. The next prime is 1200121207. The reversal of 1200121200 is 21210021.

It is a tau number, because it is divible by the number of its divisors (90).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200121207) 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 17 ways as a sum of consecutive naturals, for example, 163084 + ... + 170283.

Almost surely, 2^1200121200 is an apocalyptic number.

1200121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200121200 is an abundant number, since it is smaller than the sum of its proper divisors (2964645224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200121200 is a wasteful number, since it uses less digits than its factorization.

1200121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333391 (or 333377 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200121200 is about 34642.7654785238. The cubic root of 1200121200 is about 1062.6943441500.

Adding to 1200121200 its reverse (21210021), we get a palindrome (1221331221).

The spelling of 1200121200 in words is "one billion, two hundred million, one hundred twenty-one thousand, two hundred".