212412320221 has 2 divisors, whose sum is σ = 212412320222. Its totient is φ = 212412320220.

The previous prime is 212412320207. The next prime is 212412320293. The reversal of 212412320221 is 122023214212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169538062500 + 42874257721 = 411750^2 + 207061^2 .

It is a cyclic number.

It is not a de Polignac number, because 212412320221 - 2⁷ = 212412320093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212412320192 and 212412320201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212412320201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106206160110 + 106206160111.

It is an arithmetic number, because the mean of its divisors is an integer number (106206160111).

Almost surely, 2^212412320221 is an apocalyptic number.

It is an amenable number.

212412320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212412320221 is an equidigital number, since it uses as much as digits as its factorization.

212412320221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 212412320221 its reverse (122023214212), we get a palindrome (334435534433).

The spelling of 212412320221 in words is "two hundred twelve billion, four hundred twelve million, three hundred twenty thousand, two hundred twenty-one".