11021212220 has 48 divisors (see below), whose sum is σ = 24254717760. Its totient is φ = 4198672896.

The previous prime is 11021212201. The next prime is 11021212247. The reversal of 11021212220 is 2221212011.

It is a junction number, because it is equal to n+sod(n) for n = 11021212195 and 11021212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55766 + ... + 158594.

It is an arithmetic number, because the mean of its divisors is an integer number (505306620).

Almost surely, 2^11021212220 is an apocalyptic number.

11021212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11021212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12127358880).

11021212220 is an abundant number, since it is smaller than the sum of its proper divisors (13233505540).

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

11021212220 is a wasteful number, since it uses less digits than its factorization.

11021212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103094 (or 103092 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11021212220 its reverse (2221212011), we get a palindrome (13242424231).

The spelling of 11021212220 in words is "eleven billion, twenty-one million, two hundred twelve thousand, two hundred twenty".