212112212121220 has 24 divisors (see below), whose sum is σ = 445438597555224. Its totient is φ = 84844322543616.

The previous prime is 212112212121209. The next prime is 212112212121239. The reversal of 212112212121220 is 22121212211212.

It can be written as a sum of positive squares in 4 ways, for example, as 47756171221056 + 164356040900164 = 6910584^2 + 12820142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212112212121191 and 212112212121200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32044189 + ... + 38092708.

It is an arithmetic number, because the mean of its divisors is an integer number (18559941564801).

Almost surely, 2^{212112212121220} is an apocalyptic number.

212112212121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212112212121220 is an abundant number, since it is smaller than the sum of its proper divisors (233326385434004).

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

212112212121220 is a wasteful number, since it uses less digits than its factorization.

212112212121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70288119 (or 70288117 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 212112212121220 its reverse (22121212211212), we get a palindrome (234233424332432).

The spelling of 212112212121220 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty".