13355021 has 4 divisors (see below), whose sum is σ = 13424412. Its totient is φ = 13285632.

The previous prime is 13355009. The next prime is 13355101. The reversal of 13355021 is 12055331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12055331 = 139 ⋅86729.

It can be written as a sum of positive squares in 2 ways, for example, as 7761796 + 5593225 = 2786^2 + 2365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13355021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13354984 and 13355002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13355521) 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 3 ways as a sum of consecutive naturals, for example, 34406 + ... + 34791.

It is an arithmetic number, because the mean of its divisors is an integer number (3356103).

Almost surely, 2^13355021 is an apocalyptic number.

It is an amenable number.

13355021 is a deficient number, since it is larger than the sum of its proper divisors (69391).

13355021 is an equidigital number, since it uses as much as digits as its factorization.

13355021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69390.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 13355021 is about 3654.4522161331. The cubic root of 13355021 is about 237.2547185144.

The spelling of 13355021 in words is "thirteen million, three hundred fifty-five thousand, twenty-one".