135345310421 has 2 divisors, whose sum is σ = 135345310422. Its totient is φ = 135345310420.

The previous prime is 135345310369. The next prime is 135345310427. The reversal of 135345310421 is 124013543531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119656495396 + 15688815025 = 345914^2 + 125255^2 .

It is a cyclic number.

It is not a de Polignac number, because 135345310421 - 2¹⁰ = 135345309397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135345310427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67672655210 + 67672655211.

It is an arithmetic number, because the mean of its divisors is an integer number (67672655211).

Almost surely, 2^135345310421 is an apocalyptic number.

It is an amenable number.

135345310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135345310421 is an equidigital number, since it uses as much as digits as its factorization.

135345310421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 135345310421 its reverse (124013543531), we get a palindrome (259358853952).

The spelling of 135345310421 in words is "one hundred thirty-five billion, three hundred forty-five million, three hundred ten thousand, four hundred twenty-one".