20121021200120 has 64 divisors (see below), whose sum is σ = 47974379587200. Its totient is φ = 7568808847360.

The previous prime is 20121021200113. The next prime is 20121021200167. The reversal of 20121021200120 is 2100212012102.

It is a junction number, because it is equal to n+sod(n) for n = 20121021200095 and 20121021200104.

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, 11202416 + ... + 12873855.

It is an arithmetic number, because the mean of its divisors is an integer number (749599681050).

Almost surely, 2^{20121021200120} is an apocalyptic number.

20121021200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121021200120 is an abundant number, since it is smaller than the sum of its proper divisors (27853358387080).

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

20121021200120 is a wasteful number, since it uses less digits than its factorization.

20121021200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24077528 (or 24077524 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121021200120 its reverse (2100212012102), we get a palindrome (22221233212222).

The spelling of 20121021200120 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, two hundred thousand, one hundred twenty".