212221022112220 has 96 divisors (see below), whose sum is σ = 487168294233600. Its totient is φ = 77014275221760.

The previous prime is 212221022112217. The next prime is 212221022112227. The reversal of 212221022112220 is 22211220122212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 212221022112191 and 212221022112200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221022112227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3992918206 + ... + 3992971354.

It is an arithmetic number, because the mean of its divisors is an integer number (5074669731600).

Almost surely, 2^{212221022112220} is an apocalyptic number.

212221022112220 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 212221022112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243584147116800).

212221022112220 is an abundant number, since it is smaller than the sum of its proper divisors (274947272121380).

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

212221022112220 is a wasteful number, since it uses less digits than its factorization.

212221022112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89755 (or 89753 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 212221022112220 its reverse (22211220122212), we get a palindrome (234432242234432).

The spelling of 212221022112220 in words is "two hundred twelve trillion, two hundred twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred twenty".