135335621021 has 2 divisors, whose sum is σ = 135335621022. Its totient is φ = 135335621020.

The previous prime is 135335621017. The next prime is 135335621063. The reversal of 135335621021 is 120126533531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81564504025 + 53771116996 = 285595^2 + 231886^2 .

It is an emirp because it is prime and its reverse (120126533531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135335621021 - 2² = 135335621017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135335621221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67667810510 + 67667810511.

It is an arithmetic number, because the mean of its divisors is an integer number (67667810511).

Almost surely, 2^135335621021 is an apocalyptic number.

It is an amenable number.

135335621021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135335621021 is an equidigital number, since it uses as much as digits as its factorization.

135335621021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 135335621021 in words is "one hundred thirty-five billion, three hundred thirty-five million, six hundred twenty-one thousand, twenty-one".