221020222117 has 2 divisors, whose sum is σ = 221020222118. Its totient is φ = 221020222116.

The previous prime is 221020222067. The next prime is 221020222121. The reversal of 221020222117 is 711222020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221018455876 + 1766241 = 470126^2 + 1329^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020222117 - 2²³ = 221011833509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020222177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510111058 + 110510111059.

It is an arithmetic number, because the mean of its divisors is an integer number (110510111059).

Almost surely, 2^221020222117 is an apocalyptic number.

It is an amenable number.

221020222117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020222117 is an equidigital number, since it uses as much as digits as its factorization.

221020222117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 221020222117 its reverse (711222020122), we get a palindrome (932242242239).

The spelling of 221020222117 in words is "two hundred twenty-one billion, twenty million, two hundred twenty-two thousand, one hundred seventeen".