13538021 has 8 divisors (see below), whose sum is σ = 15801600. Its totient is φ = 11356848.

The previous prime is 13538017. The next prime is 13538033. The reversal of 13538021 is 12083531.

13538021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13538021 - 2² = 13538017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13538071) 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 7 ways as a sum of consecutive naturals, for example, 20246 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (1975200).

Almost surely, 2^13538021 is an apocalyptic number.

It is an amenable number.

13538021 is a deficient number, since it is larger than the sum of its proper divisors (2263579).

13538021 is an equidigital number, since it uses as much as digits as its factorization.

13538021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41203.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13538021 is about 3679.4049790693. The cubic root of 13538021 is about 238.3334837345. Note that the first 3 decimals are identical.

The spelling of 13538021 in words is "thirteen million, five hundred thirty-eight thousand, twenty-one".