212221201212100 has 144 divisors (see below), whose sum is σ = 513323695180800. Its totient is φ = 75682573240320.

The previous prime is 212221201212067. The next prime is 212221201212107. The reversal of 212221201212100 is 1212102122212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (212221201212107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 332468046 + ... + 333105754.

It is an arithmetic number, because the mean of its divisors is an integer number (3564747883200).

Almost surely, 2^{212221201212100} is an apocalyptic number.

212221201212100 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 212221201212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256661847590400).

212221201212100 is an abundant number, since it is smaller than the sum of its proper divisors (301102493968700).

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

212221201212100 is a wasteful number, since it uses less digits than its factorization.

212221201212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648062 (or 648055 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212221201212100 its reverse (1212102122212), we get a palindrome (213433303334312).

The spelling of 212221201212100 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, one hundred".