212000220221 has 4 divisors (see below), whose sum is σ = 212084316444. Its totient is φ = 211916124000.

The previous prime is 212000220203. The next prime is 212000220253. The reversal of 212000220221 is 122022000212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33265747321 + 178734472900 = 182389^2 + 422770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212000220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212000220196 and 212000220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212000820221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42044330 + ... + 42049371.

It is an arithmetic number, because the mean of its divisors is an integer number (53021079111).

Almost surely, 2^212000220221 is an apocalyptic number.

It is an amenable number.

212000220221 is a deficient number, since it is larger than the sum of its proper divisors (84096223).

212000220221 is an equidigital number, since it uses as much as digits as its factorization.

212000220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84096222.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 212000220221 its reverse (122022000212), we get a palindrome (334022220433).

The spelling of 212000220221 in words is "two hundred twelve billion, two hundred twenty thousand, two hundred twenty-one".