212221321321 has 2 divisors, whose sum is σ = 212221321322. Its totient is φ = 212221321320.

The previous prime is 212221321309. The next prime is 212221321337. The reversal of 212221321321 is 123123122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206665706025 + 5555615296 = 454605^2 + 74536^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221321321 - 2⁵ = 212221321289 is a prime.

It is a super-2 number, since 2×212221321321² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212221321292 and 212221321301.

It is not a weakly prime, because it can be changed into another prime (212221322321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110660660 + 106110660661.

It is an arithmetic number, because the mean of its divisors is an integer number (106110660661).

Almost surely, 2^212221321321 is an apocalyptic number.

It is an amenable number.

212221321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221321321 is an equidigital number, since it uses as much as digits as its factorization.

212221321321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

Adding to 212221321321 its reverse (123123122212), we get a palindrome (335344443533).

The spelling of 212221321321 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-one".