212112111112220 has 144 divisors (see below), whose sum is σ = 497295143383584. Its totient is φ = 75922863667200.

The previous prime is 212112111112207. The next prime is 212112111112277. The reversal of 212112111112220 is 22211111211212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 212112111112192 and 212112111112201.

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 47 ways as a sum of consecutive naturals, for example, 213691784 + ... + 214682096.

Almost surely, 2^{212112111112220} is an apocalyptic number.

212112111112220 is a gapful number since it is divisible by the number (20) 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 212112111112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248647571691792).

212112111112220 is an abundant number, since it is smaller than the sum of its proper divisors (285183032271364).

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

212112111112220 is a wasteful number, since it uses less digits than its factorization.

212112111112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991732 (or 991719 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212112111112220 its reverse (22211111211212), we get a palindrome (234323222323432).

The spelling of 212112111112220 in words is "two hundred twelve trillion, one hundred twelve billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty".