135336565421 has 2 divisors, whose sum is σ = 135336565422. Its totient is φ = 135336565420.

The previous prime is 135336565391. The next prime is 135336565447. The reversal of 135336565421 is 124565633531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94334365321 + 41002200100 = 307139^2 + 202490^2 .

It is an emirp because it is prime and its reverse (124565633531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135336565421 - 2²² = 135332371117 is a prime.

It is a super-2 number, since 2×135336565421² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135336565921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67668282710 + 67668282711.

It is an arithmetic number, because the mean of its divisors is an integer number (67668282711).

Almost surely, 2^135336565421 is an apocalyptic number.

It is an amenable number.

135336565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135336565421 is an equidigital number, since it uses as much as digits as its factorization.

135336565421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 44.

The spelling of 135336565421 in words is "one hundred thirty-five billion, three hundred thirty-six million, five hundred sixty-five thousand, four hundred twenty-one".