11112221221020 has 288 divisors, whose sum is σ = 34722835999488. Its totient is φ = 2875242479616.

The previous prime is 11112221221009. The next prime is 11112221221033. The reversal of 11112221221020 is 2012212221111.

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 = 11112221220984 and 11112221221002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1533351037 + ... + 1533358283.

It is an arithmetic number, because the mean of its divisors is an integer number (120565402776).

Almost surely, 2^{11112221221020} is an apocalyptic number.

11112221221020 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 11112221221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17361417999744).

11112221221020 is an abundant number, since it is smaller than the sum of its proper divisors (23610614778468).

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

11112221221020 is a wasteful number, since it uses less digits than its factorization.

11112221221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069 (or 9064 counting only the distinct ones).

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

Adding to 11112221221020 its reverse (2012212221111), we get a palindrome (13124433442131).

The spelling of 11112221221020 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty".