13135021 has 4 divisors (see below), whose sum is σ = 13142844. Its totient is φ = 13127200.

The previous prime is 13135019. The next prime is 13135027. The reversal of 13135021 is 12053131.

13135021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2604996 + 10530025 = 1614^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 13135021 - 2¹ = 13135019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13134986 and 13135004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13135027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250 + ... + 5131.

It is an arithmetic number, because the mean of its divisors is an integer number (3285711).

Almost surely, 2^13135021 is an apocalyptic number.

It is an amenable number.

13135021 is a deficient number, since it is larger than the sum of its proper divisors (7823).

13135021 is an equidigital number, since it uses as much as digits as its factorization.

13135021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 13135021 is about 3624.2269520547. The cubic root of 13135021 is about 235.9447167741.

Adding to 13135021 its reverse (12053131), we get a palindrome (25188152).

The spelling of 13135021 in words is "thirteen million, one hundred thirty-five thousand, twenty-one".