212101220 has 24 divisors (see below), whose sum is σ = 446551224. Its totient is φ = 84623616.

The previous prime is 212101207. The next prime is 212101223. The reversal of 212101220 is 22101212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93857344 + 118243876 = 9688^2 + 10874^2 .

It is not an unprimeable number, because it can be changed into a prime (212101223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5417 + ... + 21296.

It is an arithmetic number, because the mean of its divisors is an integer number (18606301).

Almost surely, 2^212101220 is an apocalyptic number.

212101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212101220 is an abundant number, since it is smaller than the sum of its proper divisors (234450004).

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

212101220 is a wasteful number, since it uses less digits than its factorization.

212101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27119 (or 27117 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 212101220 is about 14563.6952728351. The cubic root of 212101220 is about 596.3680781170.

Adding to 212101220 its reverse (22101212), we get a palindrome (234202432).

The spelling of 212101220 in words is "two hundred twelve million, one hundred one thousand, two hundred twenty".