11221221011220 has 144 divisors (see below), whose sum is σ = 37186411010112. Its totient is φ = 2716312811520.

The previous prime is 11221221011219. The next prime is 11221221011243. The reversal of 11221221011220 is 2211012212211.

11221221011220 is a `hidden beast` number, since 1 + 1 + 221 + 2 + 210 + 11 + 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 = 11221221011193 and 11221221011202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2796477 + ... + 5501156.

It is an arithmetic number, because the mean of its divisors is an integer number (258238965348).

Almost surely, 2^{11221221011220} is an apocalyptic number.

11221221011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221221011220 is an abundant number, since it is smaller than the sum of its proper divisors (25965189998892).

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

11221221011220 is a wasteful number, since it uses less digits than its factorization.

11221221011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298342 (or 8298337 counting only the distinct ones).

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

Adding to 11221221011220 its reverse (2211012212211), we get a palindrome (13432233223431).

The spelling of 11221221011220 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred twenty".