111211210012020 has 192 divisors, whose sum is σ = 347103663540480. Its totient is φ = 26439585103872.

The previous prime is 111211210011997. The next prime is 111211210012027. The reversal of 111211210012020 is 20210012112111.

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 not an unprimeable number, because it can be changed into a prime (111211210012027) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 161537644 + ... + 162224636.

It is an arithmetic number, because the mean of its divisors is an integer number (1807831580940).

Almost surely, 2^{111211210012020} is an apocalyptic number.

111211210012020 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 111211210012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173551831770240).

111211210012020 is an abundant number, since it is smaller than the sum of its proper divisors (235892453528460).

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

111211210012020 is a wasteful number, since it uses less digits than its factorization.

111211210012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695394 (or 695392 counting only the distinct ones).

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

Adding to 111211210012020 its reverse (20210012112111), we get a palindrome (131421222124131).

The spelling of 111211210012020 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred ten million, twelve thousand, twenty".