111212213020 has 96 divisors (see below), whose sum is σ = 238951581120. Its totient is φ = 43469414400.

The previous prime is 111212213009. The next prime is 111212213051. The reversal of 111212213020 is 20312212111.

It is a junction number, because it is equal to n+sod(n) for n = 111212212985 and 111212213003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109138071 + ... + 109139089.

It is an arithmetic number, because the mean of its divisors is an integer number (2489078970).

Almost surely, 2^111212213020 is an apocalyptic number.

111212213020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212213020 is an abundant number, since it is smaller than the sum of its proper divisors (127739368100).

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

111212213020 is a wasteful number, since it uses less digits than its factorization.

111212213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783 (or 1781 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 111212213020 its reverse (20312212111), we get a palindrome (131524425131).

Subtracting from 111212213020 its reverse (20312212111), we obtain a palindrome (90900000909).

The spelling of 111212213020 in words is "one hundred eleven billion, two hundred twelve million, two hundred thirteen thousand, twenty".