13525421 has 24 divisors (see below), whose sum is σ = 17955000. Its totient is φ = 10063872.

The previous prime is 13525411. The next prime is 13525453. The reversal of 13525421 is 12452531.

It can be written as a sum of positive squares in 4 ways, for example, as 1177225 + 12348196 = 1085^2 + 3514^2 .

It is not a de Polignac number, because 13525421 - 2²² = 9331117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13525411) 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 23 ways as a sum of consecutive naturals, for example, 10205 + ... + 11453.

It is an arithmetic number, because the mean of its divisors is an integer number (748125).

Almost surely, 2^13525421 is an apocalyptic number.

It is an amenable number.

13525421 is a deficient number, since it is larger than the sum of its proper divisors (4429579).

13525421 is a wasteful number, since it uses less digits than its factorization.

13525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293 (or 1286 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 13525421 is about 3677.6923471112. The cubic root of 13525421 is about 238.2595208311.

Adding to 13525421 its reverse (12452531), we get a palindrome (25977952).

The spelling of 13525421 in words is "thirteen million, five hundred twenty-five thousand, four hundred twenty-one".