221102221221220 has 12 divisors (see below), whose sum is σ = 464314664564604. Its totient is φ = 88440888488480.

The previous prime is 221102221221163. The next prime is 221102221221229. The reversal of 221102221221220 is 22122122201122.

It can be written as a sum of positive squares in 2 ways, for example, as 128234923735396 + 92867297485824 = 11324086^2 + 9636768^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221102221221191 and 221102221221200.

It is not an unprimeable number, because it can be changed into a prime (221102221221229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5527555530511 + ... + 5527555530550.

It is an arithmetic number, because the mean of its divisors is an integer number (38692888713717).

Almost surely, 2^{221102221221220} is an apocalyptic number.

221102221221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102221221220 is an abundant number, since it is smaller than the sum of its proper divisors (243212443343384).

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

221102221221220 is a wasteful number, since it uses less digits than its factorization.

221102221221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11055111061070 (or 11055111061068 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221102221221220 its reverse (22122122201122), we get a palindrome (243224343422342).

The spelling of 221102221221220 in words is "two hundred twenty-one trillion, one hundred two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".