13530921 has 4 divisors (see below), whose sum is σ = 18041232. Its totient is φ = 9020612.

The previous prime is 13530919. The next prime is 13530931. The reversal of 13530921 is 12903531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13530921 - 2¹ = 13530919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13530891 and 13530900.

It is not an unprimeable number, because it can be changed into a prime (13530931) 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, 2255151 + ... + 2255156.

It is an arithmetic number, because the mean of its divisors is an integer number (4510308).

Almost surely, 2^13530921 is an apocalyptic number.

It is an amenable number.

13530921 is a deficient number, since it is larger than the sum of its proper divisors (4510311).

13530921 is an equidigital number, since it uses as much as digits as its factorization.

13530921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510310.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 13530921 is about 3678.4400226183. The cubic root of 13530921 is about 238.2918118722.

The spelling of 13530921 in words is "thirteen million, five hundred thirty thousand, nine hundred twenty-one".