221200111220 has 48 divisors (see below), whose sum is σ = 528781938048. Its totient is φ = 76939167360.

The previous prime is 221200111201. The next prime is 221200111241. The reversal of 221200111220 is 22111002122.

It is a junction number, because it is equal to n+sod(n) for n = 221200111195 and 221200111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21852659 + ... + 21862778.

It is an arithmetic number, because the mean of its divisors is an integer number (11016290376).

Almost surely, 2^221200111220 is an apocalyptic number.

221200111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200111220 is an abundant number, since it is smaller than the sum of its proper divisors (307581826828).

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

221200111220 is a wasteful number, since it uses less digits than its factorization.

221200111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43715480 (or 43715478 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221200111220 its reverse (22111002122), we get a palindrome (243311113342).

The spelling of 221200111220 in words is "two hundred twenty-one billion, two hundred million, one hundred eleven thousand, two hundred twenty".