11101221000000 has 1764 divisors, whose sum is σ = 44099322318324. Its totient is φ = 2659737600000.

The previous prime is 11101220999989. The next prime is 11101221000013. The reversal of 11101221000000 is 12210111.

It is a happy number.

It can be written as a sum of positive squares in 42 ways, for example, as 8606666098944 + 2494554901056 = 2933712^2 + 1579416^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 209456999974 + ... + 209457000026.

Almost surely, 2^{11101221000000} is an apocalyptic number.

11101221000000 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 11101221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22049661159162).

11101221000000 is an abundant number, since it is smaller than the sum of its proper divisors (32998101318324).

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

11101221000000 is an frugal number, since it uses more digits than its factorization.

11101221000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11101221000000 its reverse (12210111), we get a palindrome (11101233210111).

The spelling of 11101221000000 in words is "eleven trillion, one hundred one billion, two hundred twenty-one million", and thus it is an aban number.