221110202221220 has 24 divisors (see below), whose sum is σ = 500049226562424. Its totient is φ = 81640690050816.

The previous prime is 221110202221193. The next prime is 221110202221241. The reversal of 221110202221220 is 22122202011122.

It can be written as a sum of positive squares in 4 ways, for example, as 5965786710016 + 215144415511204 = 2442496^2 + 14667802^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221110202221192 and 221110202221201.

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, 425211927089 + ... + 425211927608.

It is an arithmetic number, because the mean of its divisors is an integer number (20835384440101).

Almost surely, 2^{221110202221220} is an apocalyptic number.

221110202221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221110202221220 is an abundant number, since it is smaller than the sum of its proper divisors (278939024341204).

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

221110202221220 is a wasteful number, since it uses less digits than its factorization.

221110202221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850423854719 (or 850423854717 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221110202221220 its reverse (22122202011122), we get a palindrome (243232404232342).

The spelling of 221110202221220 in words is "two hundred twenty-one trillion, one hundred ten billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty".