111221511837920 has 192 divisors, whose sum is σ = 288364393481472. Its totient is φ = 40202652672000.

The previous prime is 111221511837907. The next prime is 111221511837929. The reversal of 111221511837920 is 29738115122111.

It is a Cunningham number, because it is equal to 10546161²-1.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221511837929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231775835 + ... + 232255205.

It is an arithmetic number, because the mean of its divisors is an integer number (1501897882716).

Almost surely, 2^{111221511837920} is an apocalyptic number.

111221511837920 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 111221511837920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144182196740736).

111221511837920 is an abundant number, since it is smaller than the sum of its proper divisors (177142881643552).

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

111221511837920 is a wasteful number, since it uses less digits than its factorization.

111221511837920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480185 (or 480177 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 44.

The spelling of 111221511837920 in words is "one hundred eleven trillion, two hundred twenty-one billion, five hundred eleven million, eight hundred thirty-seven thousand, nine hundred twenty".