221211210220 has 144 divisors (see below), whose sum is σ = 628448595264. Its totient is φ = 63645120000.

The previous prime is 221211210203. The next prime is 221211210247. The reversal of 221211210220 is 22012112122.

It is a happy number.

221211210220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221211210194 and 221211210203.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 282031 + ... + 722470.

It is an arithmetic number, because the mean of its divisors is an integer number (4364226356).

Almost surely, 2^221211210220 is an apocalyptic number.

221211210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211210220 is an abundant number, since it is smaller than the sum of its proper divisors (407237385044).

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

221211210220 is a wasteful number, since it uses less digits than its factorization.

221211210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004552 (or 1004539 counting only the distinct ones).

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

Adding to 221211210220 its reverse (22012112122), we get a palindrome (243223322342).

It can be divided in two parts, 2212112102 and 20, that added together give a palindrome (2212112122).

The spelling of 221211210220 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, two hundred twenty".