135213305021 has 2 divisors, whose sum is σ = 135213305022. Its totient is φ = 135213305020.

The previous prime is 135213305009. The next prime is 135213305053. The reversal of 135213305021 is 120503312531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96232725796 + 38980579225 = 310214^2 + 197435^2 .

It is a cyclic number.

It is not a de Polignac number, because 135213305021 - 2³⁴ = 118033435837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135213335021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67606652510 + 67606652511.

It is an arithmetic number, because the mean of its divisors is an integer number (67606652511).

Almost surely, 2^135213305021 is an apocalyptic number.

It is an amenable number.

135213305021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135213305021 is an equidigital number, since it uses as much as digits as its factorization.

135213305021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 135213305021 its reverse (120503312531), we get a palindrome (255716617552).

The spelling of 135213305021 in words is "one hundred thirty-five billion, two hundred thirteen million, three hundred five thousand, twenty-one".