135501021 has 12 divisors (see below), whose sum is σ = 202473180. Its totient is φ = 87218880.

The previous prime is 135501013. The next prime is 135501043. The reversal of 135501021 is 120105531.

135501021 is a `hidden beast` number, since 13 + 550 + 102 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57972996 + 77528025 = 7614^2 + 8805^2 .

It is not a de Polignac number, because 135501021 - 2³ = 135501013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135500985 and 135501003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259320 + ... + 259841.

It is an arithmetic number, because the mean of its divisors is an integer number (16872765).

Almost surely, 2^135501021 is an apocalyptic number.

It is an amenable number.

135501021 is a deficient number, since it is larger than the sum of its proper divisors (66972159).

135501021 is a wasteful number, since it uses less digits than its factorization.

135501021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519196 (or 519193 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 135501021 is about 11640.4905824454. The cubic root of 135501021 is about 513.6266182124.

Adding to 135501021 its reverse (120105531), we get a palindrome (255606552).

The spelling of 135501021 in words is "one hundred thirty-five million, five hundred one thousand, twenty-one".