135025021 has 2 divisors, whose sum is σ = 135025022. Its totient is φ = 135025020.

The previous prime is 135024997. The next prime is 135025043. The reversal of 135025021 is 120520531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125328025 + 9696996 = 11195^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 135025021 - 2⁷ = 135024893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135025021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135025061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67512510 + 67512511.

It is an arithmetic number, because the mean of its divisors is an integer number (67512511).

Almost surely, 2^135025021 is an apocalyptic number.

It is an amenable number.

135025021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135025021 is an equidigital number, since it uses as much as digits as its factorization.

135025021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 135025021 is about 11620.0267211397. The cubic root of 135025021 is about 513.0244748661.

Adding to 135025021 its reverse (120520531), we get a palindrome (255545552).

The spelling of 135025021 in words is "one hundred thirty-five million, twenty-five thousand, twenty-one".