135421513325321 has 2 divisors, whose sum is σ = 135421513325322. Its totient is φ = 135421513325320.

The previous prime is 135421513325303. The next prime is 135421513325339. The reversal of 135421513325321 is 123523315124531.

It is a balanced prime because it is at equal distance from previous prime (135421513325303) and next prime (135421513325339).

It can be written as a sum of positive squares in only one way, i.e., 125422864585225 + 9998648740096 = 11199235^2 + 3162064^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421513325321 - 2⁶ = 135421513325257 is a prime.

It is not a weakly prime, because it can be changed into another prime (135421513325521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710756662660 + 67710756662661.

It is an arithmetic number, because the mean of its divisors is an integer number (67710756662661).

Almost surely, 2^{135421513325321} is an apocalyptic number.

It is an amenable number.

135421513325321 is a deficient number, since it is larger than the sum of its proper divisors (1).

135421513325321 is an equidigital number, since it uses as much as digits as its factorization.

135421513325321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 41.

Adding to 135421513325321 its reverse (123523315124531), we get a palindrome (258944828449852).

The spelling of 135421513325321 in words is "one hundred thirty-five trillion, four hundred twenty-one billion, five hundred thirteen million, three hundred twenty-five thousand, three hundred twenty-one".