21200120212112 has 80 divisors (see below), whose sum is σ = 42745386739200. Its totient is φ = 10174849551360.

The previous prime is 21200120212111. The next prime is 21200120212123. The reversal of 21200120212112 is 21121202100212.

It is not an unprimeable number, because it can be changed into a prime (21200120212111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44069939 + ... + 44548397.

It is an arithmetic number, because the mean of its divisors is an integer number (534317334240).

Almost surely, 2^{21200120212112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200120212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21372693369600).

21200120212112 is an abundant number, since it is smaller than the sum of its proper divisors (21545266527088).

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

21200120212112 is a wasteful number, since it uses less digits than its factorization.

21200120212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479224 (or 479218 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21200120212112 its reverse (21121202100212), we get a palindrome (42321322312324).

The spelling of 21200120212112 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, two hundred twelve thousand, one hundred twelve".