21120226717 has 2 divisors, whose sum is σ = 21120226718. Its totient is φ = 21120226716.

The previous prime is 21120226681. The next prime is 21120226723. The reversal of 21120226717 is 71762202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20352160921 + 768065796 = 142661^2 + 27714^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120226717 - 2²³ = 21111838109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120224717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560113358 + 10560113359.

It is an arithmetic number, because the mean of its divisors is an integer number (10560113359).

Almost surely, 2^21120226717 is an apocalyptic number.

It is an amenable number.

21120226717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120226717 is an equidigital number, since it uses as much as digits as its factorization.

21120226717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

Adding to 21120226717 its reverse (71762202112), we get a palindrome (92882428829).

The spelling of 21120226717 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-six thousand, seven hundred seventeen".