212100111220 has 48 divisors (see below), whose sum is σ = 449676501120. Its totient is φ = 84028046976.

The previous prime is 212100111217. The next prime is 212100111229. The reversal of 212100111220 is 22111001212.

212100111220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 212100111220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100111229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5830809 + ... + 5867071.

It is an arithmetic number, because the mean of its divisors is an integer number (9368260440).

Almost surely, 2^212100111220 is an apocalyptic number.

212100111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212100111220 is an abundant number, since it is smaller than the sum of its proper divisors (237576389900).

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

212100111220 is a wasteful number, since it uses less digits than its factorization.

212100111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39064 (or 39062 counting only the distinct ones).

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

Adding to 212100111220 its reverse (22111001212), we get a palindrome (234211112432).

The spelling of 212100111220 in words is "two hundred twelve billion, one hundred million, one hundred eleven thousand, two hundred twenty".