111212001021020 has 96 divisors (see below), whose sum is σ = 243262048296960. Its totient is φ = 42677543462400.

The previous prime is 111212001021001. The next prime is 111212001021031. The reversal of 111212001021020 is 20120100212111.

It is a junction number, because it is equal to n+sod(n) for n = 111212001020986 and 111212001021004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6746309 + ... + 16368771.

It is an arithmetic number, because the mean of its divisors is an integer number (2533979669760).

Almost surely, 2^{111212001021020} is an apocalyptic number.

111212001021020 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 111212001021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121631024148480).

111212001021020 is an abundant number, since it is smaller than the sum of its proper divisors (132050047275940).

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

111212001021020 is a wasteful number, since it uses less digits than its factorization.

111212001021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9622755 (or 9622753 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111212001021020 its reverse (20120100212111), we get a palindrome (131332101233131).

The spelling of 111212001021020 in words is "one hundred eleven trillion, two hundred twelve billion, one million, twenty-one thousand, twenty".