221211080221 has 2 divisors, whose sum is σ = 221211080222. Its totient is φ = 221211080220.

The previous prime is 221211080213. The next prime is 221211080309. The reversal of 221211080221 is 122080112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125659615225 + 95551464996 = 354485^2 + 309114^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211080221 - 2³ = 221211080213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211080192 and 221211080201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211080521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605540110 + 110605540111.

It is an arithmetic number, because the mean of its divisors is an integer number (110605540111).

Almost surely, 2^221211080221 is an apocalyptic number.

It is an amenable number.

221211080221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211080221 is an equidigital number, since it uses as much as digits as its factorization.

221211080221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221211080221 its reverse (122080112122), we get a palindrome (343291192343).

The spelling of 221211080221 in words is "two hundred twenty-one billion, two hundred eleven million, eighty thousand, two hundred twenty-one".