135326021 has 2 divisors, whose sum is σ = 135326022. Its totient is φ = 135326020.

The previous prime is 135326011. The next prime is 135326027. The reversal of 135326021 is 120623531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 66601921 = 8290^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 135326021 - 2¹⁰ = 135324997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135326027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67663010 + 67663011.

It is an arithmetic number, because the mean of its divisors is an integer number (67663011).

Almost surely, 2^135326021 is an apocalyptic number.

It is an amenable number.

135326021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135326021 is an equidigital number, since it uses as much as digits as its factorization.

135326021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 135326021 is about 11632.9712885402. The cubic root of 135326021 is about 513.4054061488.

Adding to 135326021 its reverse (120623531), we get a palindrome (255949552).

The spelling of 135326021 in words is "one hundred thirty-five million, three hundred twenty-six thousand, twenty-one".