111120012121020 has 384 divisors, whose sum is σ = 376643101685760. Its totient is φ = 23911653703680.

The previous prime is 111120012121009. The next prime is 111120012121049. The reversal of 111120012121020 is 20121210021111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1449233404 + ... + 1449310076.

It is an arithmetic number, because the mean of its divisors is an integer number (980841410640).

Almost surely, 2^{111120012121020} is an apocalyptic number.

111120012121020 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 111120012121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188321550842880).

111120012121020 is an abundant number, since it is smaller than the sum of its proper divisors (265523089564740).

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

111120012121020 is a wasteful number, since it uses less digits than its factorization.

111120012121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77845 (or 77843 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111120012121020 its reverse (20121210021111), we get a palindrome (131241222142131).

The spelling of 111120012121020 in words is "one hundred eleven trillion, one hundred twenty billion, twelve million, one hundred twenty-one thousand, twenty".