11011221221220 has 72 divisors (see below), whose sum is σ = 36437132047680. Its totient is φ = 2669386962240.

The previous prime is 11011221221179. The next prime is 11011221221233. The reversal of 11011221221220 is 2212212211011.

11011221221220 is a `hidden beast` number, since 1 + 1 + 0 + 1 + 1 + 221 + 221 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11011221221193 and 11011221221202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2780609440 + ... + 2780613399.

It is an arithmetic number, because the mean of its divisors is an integer number (506071278440).

Almost surely, 2^{11011221221220} is an apocalyptic number.

11011221221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011221221220 is an abundant number, since it is smaller than the sum of its proper divisors (25425910826460).

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

11011221221220 is a wasteful number, since it uses less digits than its factorization.

11011221221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561222865 (or 5561222860 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11011221221220 its reverse (2212212211011), we get a palindrome (13223433432231).

The spelling of 11011221221220 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".