21222020117 has 2 divisors, whose sum is σ = 21222020118. Its totient is φ = 21222020116.

The previous prime is 21222020089. The next prime is 21222020129. The reversal of 21222020117 is 71102022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18005882596 + 3216137521 = 134186^2 + 56711^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222020117 - 2¹⁶ = 21221954581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222020147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611010058 + 10611010059.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010059).

Almost surely, 2^21222020117 is an apocalyptic number.

It is an amenable number.

21222020117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222020117 is an equidigital number, since it uses as much as digits as its factorization.

21222020117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21222020117 its reverse (71102022212), we get a palindrome (92324042329).

The spelling of 21222020117 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred seventeen".