13345021 has 4 divisors (see below), whose sum is σ = 13367200. Its totient is φ = 13322844.

The previous prime is 13345009. The next prime is 13345027. The reversal of 13345021 is 12054331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12054331 = 229 ⋅52639.

It is a cyclic number.

It is not a de Polignac number, because 13345021 - 2¹⁵ = 13312253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13345021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13345027) 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, 10161 + ... + 11398.

It is an arithmetic number, because the mean of its divisors is an integer number (3341800).

Almost surely, 2^13345021 is an apocalyptic number.

It is an amenable number.

13345021 is a deficient number, since it is larger than the sum of its proper divisors (22179).

13345021 is an equidigital number, since it uses as much as digits as its factorization.

13345021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22178.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 13345021 is about 3653.0837658066. The cubic root of 13345021 is about 237.1954863698.

Adding to 13345021 its reverse (12054331), we get a palindrome (25399352).

It can be divided in two parts, 133 and 45021, that added together give a palindrome (45154).

The spelling of 13345021 in words is "thirteen million, three hundred forty-five thousand, twenty-one".