11221220121020 has 192 divisors, whose sum is σ = 29433033670656. Its totient is φ = 3498946191360.

The previous prime is 11221220120987. The next prime is 11221220121047. The reversal of 11221220121020 is 2012102212211.

It is a self number, because there is not a number n which added to its sum of digits gives 11221220121020.

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 63 ways as a sum of consecutive naturals, for example, 39225905 + ... + 39510935.

It is an arithmetic number, because the mean of its divisors is an integer number (153297050368).

Almost surely, 2^{11221220121020} is an apocalyptic number.

11221220121020 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 11221220121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14716516835328).

11221220121020 is an abundant number, since it is smaller than the sum of its proper divisors (18211813549636).

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

11221220121020 is a wasteful number, since it uses less digits than its factorization.

11221220121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285380 (or 285378 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11221220121020 its reverse (2012102212211), we get a palindrome (13233322333231).

The spelling of 11221220121020 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twenty".