20012021100120 has 128 divisors (see below), whose sum is σ = 70012901952000. Its totient is φ = 4574176242048.

The previous prime is 20012021100041. The next prime is 20012021100121. The reversal of 20012021100120 is 2100112021002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20012021100096 and 20012021100105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012021100121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243059194 + ... + 243141513.

It is an arithmetic number, because the mean of its divisors is an integer number (546975796500).

Almost surely, 2^{20012021100120} is an apocalyptic number.

20012021100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012021100120 is an abundant number, since it is smaller than the sum of its proper divisors (50000880851880).

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

20012021100120 is a wasteful number, since it uses less digits than its factorization.

20012021100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486200742 (or 486200724 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012021100120 its reverse (2100112021002), we get a palindrome (22112133121122).

The spelling of 20012021100120 in words is "twenty trillion, twelve billion, twenty-one million, one hundred thousand, one hundred twenty".