111213312020 has 24 divisors (see below), whose sum is σ = 233610675144. Its totient is φ = 44473378176.

The previous prime is 111213312013. The next prime is 111213312031. The reversal of 111213312020 is 20213312111.

It can be written as a sum of positive squares in 4 ways, for example, as 3053888644 + 108159423376 = 55262^2 + 328876^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 111213312020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670139 + ... + 819458.

It is an arithmetic number, because the mean of its divisors is an integer number (9733778131).

Almost surely, 2^111213312020 is an apocalyptic number.

111213312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111213312020 is an abundant number, since it is smaller than the sum of its proper divisors (122397363124).

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

111213312020 is a wasteful number, since it uses less digits than its factorization.

111213312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493339 (or 1493337 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 111213312020 its reverse (20213312111), we get a palindrome (131426624131).

Subtracting from 111213312020 its reverse (20213312111), we obtain a palindrome (90999999909).

The spelling of 111213312020 in words is "one hundred eleven billion, two hundred thirteen million, three hundred twelve thousand, twenty".