1111221111000 has 2048 divisors, whose sum is σ = 4881682391040. Its totient is φ = 203046912000.

The previous prime is 1111221110971. The next prime is 1111221111023. The reversal of 1111221111000 is 1111221111.

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

It is a zygodrome in base 10.

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 511 ways as a sum of consecutive naturals, for example, 8111102932 + ... + 8111103068.

It is an arithmetic number, because the mean of its divisors is an integer number (2383633980).

Almost surely, 2^{1111221111000} is an apocalyptic number.

1111221111000 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 1111221111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440841195520).

1111221111000 is an abundant number, since it is smaller than the sum of its proper divisors (3770461280040).

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

1111221111000 is a wasteful number, since it uses less digits than its factorization.

1111221111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1111221111000 its reverse (1111221111), we get a palindrome (1112332332111).

1111221111000 divided by its reverse (1111221111) gives a cube (1000 = 10³).

It can be divided in two parts, 1111221 and 111000, that added together give a palindrome (1222221).

The spelling of 1111221111000 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand".