20121021100212 has 96 divisors (see below), whose sum is σ = 47187891878400. Its totient is φ = 6672988586880.

The previous prime is 20121021100183. The next prime is 20121021100237. The reversal of 20121021100212 is 21200112012102.

It is a junction number, because it is equal to n+sod(n) for n = 20121021100191 and 20121021100200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6560487903 + ... + 6560490969.

It is an arithmetic number, because the mean of its divisors is an integer number (491540540400).

Almost surely, 2^{20121021100212} is an apocalyptic number.

It is an amenable number.

20121021100212 is an abundant number, since it is smaller than the sum of its proper divisors (27066870778188).

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

20121021100212 is a wasteful number, since it uses less digits than its factorization.

20121021100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6381 (or 6379 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121021100212 its reverse (21200112012102), we get a palindrome (41321133112314).

The spelling of 20121021100212 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred twelve".