135411021 has 14 divisors (see below), whose sum is σ = 203024750. Its totient is φ = 90273528.

The previous prime is 135411019. The next prime is 135411047. The reversal of 135411021 is 120114531.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 8037225 = 11286^2 + 2835^2 .

It is not a de Polignac number, because 135411021 - 2¹ = 135411019 is a prime.

It is a super-2 number, since 2×135411021² = 36672289216524882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135410985 and 135411003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135411011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 92146 + ... + 93603.

Almost surely, 2^135411021 is an apocalyptic number.

It is an amenable number.

135411021 is a deficient number, since it is larger than the sum of its proper divisors (67613729).

135411021 is an frugal number, since it uses more digits than its factorization.

135411021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185767 (or 185752 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 135411021 is about 11636.6241238600. The cubic root of 135411021 is about 513.5128758125.

Adding to 135411021 its reverse (120114531), we get a palindrome (255525552).

The spelling of 135411021 in words is "one hundred thirty-five million, four hundred eleven thousand, twenty-one".