221122012220 has 96 divisors (see below), whose sum is σ = 475895165760. Its totient is φ = 86277335040.

The previous prime is 221122012183. The next prime is 221122012261. The reversal of 221122012220 is 22210221122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154955147 + ... + 154956573.

It is an arithmetic number, because the mean of its divisors is an integer number (4957241310).

Almost surely, 2^221122012220 is an apocalyptic number.

221122012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221122012220 is an abundant number, since it is smaller than the sum of its proper divisors (254773153540).

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

221122012220 is a wasteful number, since it uses less digits than its factorization.

221122012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463 (or 2461 counting only the distinct ones).

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

Adding to 221122012220 its reverse (22210221122), we get a palindrome (243332233342).

The spelling of 221122012220 in words is "two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty".