17420135521 has 2 divisors, whose sum is σ = 17420135522. Its totient is φ = 17420135520.

The previous prime is 17420135497. The next prime is 17420135527. The reversal of 17420135521 is 12553102471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17295143121 + 124992400 = 131511^2 + 11180^2 .

It is a cyclic number.

It is not a de Polignac number, because 17420135521 - 2¹¹ = 17420133473 is a prime.

It is a super-2 number, since 2×17420135521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17420135527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8710067760 + 8710067761.

It is an arithmetic number, because the mean of its divisors is an integer number (8710067761).

Almost surely, 2^17420135521 is an apocalyptic number.

It is an amenable number.

17420135521 is a deficient number, since it is larger than the sum of its proper divisors (1).

17420135521 is an equidigital number, since it uses as much as digits as its factorization.

17420135521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 17420135521 its reverse (12553102471), we get a palindrome (29973237992).

The spelling of 17420135521 in words is "seventeen billion, four hundred twenty million, one hundred thirty-five thousand, five hundred twenty-one".