212121222110220 has 48 divisors (see below), whose sum is σ = 628877034965088. Its totient is φ = 53238267509760.

The previous prime is 212121222110207. The next prime is 212121222110227. The reversal of 212121222110220 is 22011222121212.

It is not an unprimeable number, because it can be changed into a prime (212121222110227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103980990211 + ... + 103980992250.

It is an arithmetic number, because the mean of its divisors is an integer number (13101604895106).

Almost surely, 2^{212121222110220} is an apocalyptic number.

212121222110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121222110220 is an abundant number, since it is smaller than the sum of its proper divisors (416755812854868).

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

212121222110220 is a wasteful number, since it uses less digits than its factorization.

212121222110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207961982490 (or 207961982488 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212121222110220 its reverse (22011222121212), we get a palindrome (234132444231432).

The spelling of 212121222110220 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred ten thousand, two hundred twenty".