13528021 has 8 divisors (see below), whose sum is σ = 14699160. Its totient is φ = 12375552.

The previous prime is 13528013. The next prime is 13528027. The reversal of 13528021 is 12082531.

It can be written as a sum of positive squares in 4 ways, for example, as 1347921 + 12180100 = 1161^2 + 3490^2 .

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 13528021 - 2³ = 13528013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13527983 and 13528001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13528027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3136 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (1837395).

Almost surely, 2^13528021 is an apocalyptic number.

It is an amenable number.

13528021 is a deficient number, since it is larger than the sum of its proper divisors (1171139).

13528021 is a wasteful number, since it uses less digits than its factorization.

13528021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 13528021 is about 3678.0458126565. The cubic root of 13528021 is about 238.2747867777.

The spelling of 13528021 in words is "thirteen million, five hundred twenty-eight thousand, twenty-one".