212221102221220 has 48 divisors (see below), whose sum is σ = 456544304658288. Its totient is φ = 82816153712640.

The previous prime is 212221102221187. The next prime is 212221102221221. The reversal of 212221102221220 is 22122201122212.

It can be written as a sum of positive squares in 8 ways, for example, as 9211722746724 + 203009379474496 = 3035082^2 + 14248136^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212221102221191 and 212221102221200.

It is not an unprimeable number, because it can be changed into a prime (212221102221221) 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, 34406842 + ... + 40103278.

It is an arithmetic number, because the mean of its divisors is an integer number (9511339680381).

Almost surely, 2^{212221102221220} is an apocalyptic number.

212221102221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221102221220 is an abundant number, since it is smaller than the sum of its proper divisors (244323202437068).

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

212221102221220 is a wasteful number, since it uses less digits than its factorization.

212221102221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5741920 (or 5741918 counting only the distinct ones).

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

Adding to 212221102221220 its reverse (22122201122212), we get a palindrome (234343303343432).

The spelling of 212221102221220 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty".