20002121112100 has 144 divisors (see below), whose sum is σ = 44441074339200. Its totient is φ = 7811687070720.

The previous prime is 20002121112013. The next prime is 20002121112139. The reversal of 20002121112100 is 121112120002.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3402296961 + ... + 3402302839.

It is an arithmetic number, because the mean of its divisors is an integer number (308618571800).

Almost surely, 2^{20002121112100} is an apocalyptic number.

20002121112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20002121112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22220537169600).

20002121112100 is an abundant number, since it is smaller than the sum of its proper divisors (24438953227100).

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

20002121112100 is a wasteful number, since it uses less digits than its factorization.

20002121112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9782 (or 9775 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20002121112100 its reverse (121112120002), we get a palindrome (20123233232102).

The spelling of 20002121112100 in words is "twenty trillion, two billion, one hundred twenty-one million, one hundred twelve thousand, one hundred".