11122221000000 has 1568 divisors, whose sum is σ = 41970422771712. Its totient is φ = 2576000000000.

The previous prime is 11122220999987. The next prime is 11122221000043. The reversal of 11122221000000 is 12222111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 11122221000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 110120999950 + ... + 110121000050.

Almost surely, 2^{11122221000000} is an apocalyptic number.

11122221000000 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 11122221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20985211385856).

11122221000000 is an abundant number, since it is smaller than the sum of its proper divisors (30848201771712).

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

11122221000000 is an equidigital number, since it uses as much as digits as its factorization.

11122221000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11122221000000 its reverse (12222111), we get a palindrome (11122233222111).

The spelling of 11122221000000 in words is "eleven trillion, one hundred twenty-two billion, two hundred twenty-one million", and thus it is an aban number.