13501021 has 4 divisors (see below), whose sum is σ = 13672000. Its totient is φ = 13330044.

The previous prime is 13501003. The next prime is 13501031. The reversal of 13501021 is 12010531.

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 13501021 - 2¹¹ = 13498973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13500992 and 13501010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13501031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85371 + ... + 85528.

It is an arithmetic number, because the mean of its divisors is an integer number (3418000).

Almost surely, 2^13501021 is an apocalyptic number.

It is an amenable number.

13501021 is a deficient number, since it is larger than the sum of its proper divisors (170979).

13501021 is an equidigital number, since it uses as much as digits as its factorization.

13501021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170978.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 13501021 is about 3674.3735520494. The cubic root of 13501021 is about 238.1161603716.

Adding to 13501021 its reverse (12010531), we get a palindrome (25511552).

The spelling of 13501021 in words is "thirteen million, five hundred one thousand, twenty-one".