221210222021017 has 2 divisors, whose sum is σ = 221210222021018. Its totient is φ = 221210222021016.

The previous prime is 221210222020891. The next prime is 221210222021039. The reversal of 221210222021017 is 710120222012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146492799903241 + 74717422117776 = 12103421^2 + 8643924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221210222021017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221210222020982 and 221210222021000.

It is not a weakly prime, because it can be changed into another prime (221210222022017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605111010508 + 110605111010509.

It is an arithmetic number, because the mean of its divisors is an integer number (110605111010509).

Almost surely, 2^{221210222021017} is an apocalyptic number.

It is an amenable number.

221210222021017 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210222021017 is an equidigital number, since it uses as much as digits as its factorization.

221210222021017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 221210222021017 its reverse (710120222012122), we get a palindrome (931330444033139).

The spelling of 221210222021017 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty-two million, twenty-one thousand, seventeen".