1111220111988 has 384 divisors, whose sum is σ = 3493056000000. Its totient is φ = 298426332672.

The previous prime is 1111220111987. The next prime is 1111220112103. The reversal of 1111220111988 is 8891110221111.

It is a super-2 number, since 2×1111220111988² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111220111987) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1641388306 + ... + 1641388982.

It is an arithmetic number, because the mean of its divisors is an integer number (9096500000).

Almost surely, 2^{1111220111988} is an apocalyptic number.

1111220111988 is a gapful number since it is divisible by the number (18) 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 1111220111988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746528000000).

1111220111988 is an abundant number, since it is smaller than the sum of its proper divisors (2381835888012).

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

1111220111988 is a wasteful number, since it uses less digits than its factorization.

1111220111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 36.

The spelling of 1111220111988 in words is "one trillion, one hundred eleven billion, two hundred twenty million, one hundred eleven thousand, nine hundred eighty-eight".