212211201220 has 48 divisors (see below), whose sum is σ = 460668902400. Its totient is φ = 82030239360.

The previous prime is 212211201197. The next prime is 212211201221. The reversal of 212211201220 is 22102112212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 212211201194 and 212211201203.

It is not an unprimeable number, because it can be changed into a prime (212211201221) 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, 198201 + ... + 680959.

It is an arithmetic number, because the mean of its divisors is an integer number (9597268800).

Almost surely, 2^212211201220 is an apocalyptic number.

212211201220 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 212211201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230334451200).

212211201220 is an abundant number, since it is smaller than the sum of its proper divisors (248457701180).

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

212211201220 is a wasteful number, since it uses less digits than its factorization.

212211201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483508 (or 483506 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212211201220 its reverse (22102112212), we get a palindrome (234313313432).

The spelling of 212211201220 in words is "two hundred twelve billion, two hundred eleven million, two hundred one thousand, two hundred twenty".