21112012221200 has 120 divisors (see below), whose sum is σ = 51905461700928. Its totient is φ = 8247733885440.

The previous prime is 21112012221199. The next prime is 21112012221203. The reversal of 21112012221200 is 212221021112.

It is not an unprimeable number, because it can be changed into a prime (21112012221203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242252834 + ... + 242339966.

Almost surely, 2^{21112012221200} is an apocalyptic number.

21112012221200 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 21112012221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25952730850464).

21112012221200 is an abundant number, since it is smaller than the sum of its proper divisors (30793449479728).

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

21112012221200 is a wasteful number, since it uses less digits than its factorization.

21112012221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101281 (or 101270 counting only the distinct ones).

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

Adding to 21112012221200 its reverse (212221021112), we get a palindrome (21324233242312).

The spelling of 21112012221200 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-one thousand, two hundred".