221020022220 has 48 divisors (see below), whose sum is σ = 619039131648. Its totient is φ = 58921237440.

The previous prime is 221020022207. The next prime is 221020022221. The reversal of 221020022220 is 22220020122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221020022220.

It is not an unprimeable number, because it can be changed into a prime (221020022221) 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, 339694 + ... + 746613.

It is an arithmetic number, because the mean of its divisors is an integer number (12896648576).

Almost surely, 2^221020022220 is an apocalyptic number.

221020022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020022220 is an abundant number, since it is smaller than the sum of its proper divisors (398019109428).

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

221020022220 is a wasteful number, since it uses less digits than its factorization.

221020022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089710 (or 1089708 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 221020022220 its reverse (22220020122), we get a palindrome (243240042342).

The spelling of 221020022220 in words is "two hundred twenty-one billion, twenty million, twenty-two thousand, two hundred twenty".