221765222220 has 48 divisors (see below), whose sum is σ = 631467083520. Its totient is φ = 58135062976.

The previous prime is 221765222213. The next prime is 221765222221. The reversal of 221765222220 is 22222567122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221765222221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31319232 + ... + 31326311.

It is an arithmetic number, because the mean of its divisors is an integer number (13155564240).

Almost surely, 2^221765222220 is an apocalyptic number.

221765222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221765222220 is an abundant number, since it is smaller than the sum of its proper divisors (409701861300).

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

221765222220 is a wasteful number, since it uses less digits than its factorization.

221765222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62645614 (or 62645612 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

Adding to 221765222220 its reverse (22222567122), we get a palindrome (243987789342).

The spelling of 221765222220 in words is "two hundred twenty-one billion, seven hundred sixty-five million, two hundred twenty-two thousand, two hundred twenty".