221121202220 has 24 divisors (see below), whose sum is σ = 475153468944. Its totient is φ = 86391539136.

The previous prime is 221121202219. The next prime is 221121202249. The reversal of 221121202220 is 22202121122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128557979 + ... + 128559698.

It is an arithmetic number, because the mean of its divisors is an integer number (19798061206).

Almost surely, 2^221121202220 is an apocalyptic number.

221121202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121202220 is an abundant number, since it is smaller than the sum of its proper divisors (254032266724).

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

221121202220 is a wasteful number, since it uses less digits than its factorization.

221121202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257117729 (or 257117727 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221121202220 its reverse (22202121122), we get a palindrome (243323323342).

The spelling of 221121202220 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty".