20121002200120 has 64 divisors (see below), whose sum is σ = 45337495381920. Its totient is φ = 8036804289024.

The previous prime is 20121002200109. The next prime is 20121002200213. The reversal of 20121002200120 is 2100220012102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121002200120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 697009927 + ... + 697038793.

Almost surely, 2^{20121002200120} is an apocalyptic number.

20121002200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121002200120 is an abundant number, since it is smaller than the sum of its proper divisors (25216493181800).

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

20121002200120 is a wasteful number, since it uses less digits than its factorization.

20121002200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53384 (or 53380 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20121002200120 its reverse (2100220012102), we get a palindrome (22221222212222).

The spelling of 20121002200120 in words is "twenty trillion, one hundred twenty-one billion, two million, two hundred thousand, one hundred twenty".