1200121212120 has 64 divisors (see below), whose sum is σ = 3600720937440. Its totient is φ = 320000563200.

The previous prime is 1200121212067. The next prime is 1200121212167. The reversal of 1200121212120 is 212121210021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1200121212120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730560 + ... + 1712880.

Almost surely, 2^{1200121212120} is an apocalyptic number.

1200121212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200121212120 is an abundant number, since it is smaller than the sum of its proper divisors (2400599725320).

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

1200121212120 is a wasteful number, since it uses less digits than its factorization.

1200121212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992516 (or 992512 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1200121212120 its reverse (212121210021), we get a palindrome (1412242422141).

The spelling of 1200121212120 in words is "one trillion, two hundred billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty".