1200120010020 has 120 divisors (see below), whose sum is σ = 3800006711424. Its totient is φ = 317041003584.

The previous prime is 1200120009973. The next prime is 1200120010027. The reversal of 1200120010020 is 200100210021.

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 = 1200120009984 and 1200120010011.

It is not an unprimeable number, because it can be changed into a prime (1200120010027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3288412 + ... + 3635091.

Almost surely, 2^{1200120010020} is an apocalyptic number.

1200120010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200120010020 is an abundant number, since it is smaller than the sum of its proper divisors (2599886701404).

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

1200120010020 is a wasteful number, since it uses less digits than its factorization.

1200120010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923631 (or 6923620 counting only the distinct ones).

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

Adding to 1200120010020 its reverse (200100210021), we get a palindrome (1400220220041).

The spelling of 1200120010020 in words is "one trillion, two hundred billion, one hundred twenty million, ten thousand, twenty".