212221132220 has 12 divisors (see below), whose sum is σ = 445664377704. Its totient is φ = 84888452880.

The previous prime is 212221132141. The next prime is 212221132261. The reversal of 212221132220 is 22231122212.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10611056611 = 212221132220 / (2 + 1 + 2 + 2 + 2 + 1 + 1 + 3 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 212221132192 and 212221132201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5305528286 + ... + 5305528325.

It is an arithmetic number, because the mean of its divisors is an integer number (37138698142).

Almost surely, 2^212221132220 is an apocalyptic number.

212221132220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221132220 is an abundant number, since it is smaller than the sum of its proper divisors (233443245484).

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

212221132220 is a wasteful number, since it uses less digits than its factorization.

212221132220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611056620 (or 10611056618 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 212221132220 its reverse (22231122212), we get a palindrome (234452254432).

The spelling of 212221132220 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty".