221102001220 has 24 divisors (see below), whose sum is σ = 479292081408. Its totient is φ = 85587871200.

The previous prime is 221102001209. The next prime is 221102001229. The reversal of 221102001220 is 22100201122.

It is a happy number.

221102001220 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 221102001220.

It is not an unprimeable number, because it can be changed into a prime (221102001229) 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 7 ways as a sum of consecutive naturals, for example, 178307446 + ... + 178308685.

It is an arithmetic number, because the mean of its divisors is an integer number (19970503392).

Almost surely, 2^221102001220 is an apocalyptic number.

221102001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102001220 is an abundant number, since it is smaller than the sum of its proper divisors (258190080188).

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

221102001220 is a wasteful number, since it uses less digits than its factorization.

221102001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356616171 (or 356616169 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221102001220 its reverse (22100201122), we get a palindrome (243202202342).

The spelling of 221102001220 in words is "two hundred twenty-one billion, one hundred two million, one thousand, two hundred twenty".