212120220 has 144 divisors (see below), whose sum is σ = 680184288. Its totient is φ = 49090560.

The previous prime is 212120201. The next prime is 212120221. The reversal of 212120220 is 22021212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 212120196 and 212120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224950 + ... + 225890.

It is an arithmetic number, because the mean of its divisors is an integer number (4723502).

Almost surely, 2^212120220 is an apocalyptic number.

212120220 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 212120220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340092144).

212120220 is an abundant number, since it is smaller than the sum of its proper divisors (468064068).

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

212120220 is a wasteful number, since it uses less digits than its factorization.

212120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212120220 is about 14564.3475652018. The cubic root of 212120220 is about 596.3858851105.

Adding to 212120220 its reverse (22021212), we get a palindrome (234141432).

The spelling of 212120220 in words is "two hundred twelve million, one hundred twenty thousand, two hundred twenty".