13502421 has 6 divisors (see below), whose sum is σ = 19503510. Its totient is φ = 9001608.

The previous prime is 13502417. The next prime is 13502459. The reversal of 13502421 is 12420531.

It can be written as a sum of positive squares in only one way, i.e., 13242321 + 260100 = 3639^2 + 510^2 .

It is not a de Polignac number, because 13502421 - 2² = 13502417 is a prime.

It is a super-3 number, since 3×13502421³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 13502394 and 13502403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13502491) 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 5 ways as a sum of consecutive naturals, for example, 750126 + ... + 750143.

It is an arithmetic number, because the mean of its divisors is an integer number (3250585).

Almost surely, 2^13502421 is an apocalyptic number.

It is an amenable number.

13502421 is a deficient number, since it is larger than the sum of its proper divisors (6001089).

13502421 is a wasteful number, since it uses less digits than its factorization.

13502421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500275 (or 1500272 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13502421 is about 3674.5640557759. The cubic root of 13502421 is about 238.1243906406.

Adding to 13502421 its reverse (12420531), we get a palindrome (25922952).

The spelling of 13502421 in words is "thirteen million, five hundred two thousand, four hundred twenty-one".