221201112220 has 48 divisors (see below), whose sum is σ = 506934741600. Its totient is φ = 80407704320.

The previous prime is 221201112217. The next prime is 221201112263. The reversal of 221201112220 is 22211102122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221201112194 and 221201112203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433326 + ... + 793834.

It is an arithmetic number, because the mean of its divisors is an integer number (10561140450).

Almost surely, 2^221201112220 is an apocalyptic number.

221201112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201112220 is an abundant number, since it is smaller than the sum of its proper divisors (285733629380).

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

221201112220 is a wasteful number, since it uses less digits than its factorization.

221201112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363318 (or 363316 counting only the distinct ones).

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

Adding to 221201112220 its reverse (22211102122), we get a palindrome (243412214342).

The spelling of 221201112220 in words is "two hundred twenty-one billion, two hundred one million, one hundred twelve thousand, two hundred twenty".