212011220221 has 2 divisors, whose sum is σ = 212011220222. Its totient is φ = 212011220220.

The previous prime is 212011220209. The next prime is 212011220227. The reversal of 212011220221 is 122022110212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132634356100 + 79376864121 = 364190^2 + 281739^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011220221 - 2¹⁷ = 212011089149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212011220195 and 212011220204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011220227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005610110 + 106005610111.

It is an arithmetic number, because the mean of its divisors is an integer number (106005610111).

Almost surely, 2^212011220221 is an apocalyptic number.

It is an amenable number.

212011220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011220221 is an equidigital number, since it uses as much as digits as its factorization.

212011220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212011220221 its reverse (122022110212), we get a palindrome (334033330433).

The spelling of 212011220221 in words is "two hundred twelve billion, eleven million, two hundred twenty thousand, two hundred twenty-one".