13224021 has 4 divisors (see below), whose sum is σ = 17632032. Its totient is φ = 8816012.

The previous prime is 13223957. The next prime is 13224037. The reversal of 13224021 is 12042231.

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 13224021 - 2⁶ = 13223957 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 (13224221) 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, 2204001 + ... + 2204006.

It is an arithmetic number, because the mean of its divisors is an integer number (4408008).

Almost surely, 2^13224021 is an apocalyptic number.

It is an amenable number.

13224021 is a deficient number, since it is larger than the sum of its proper divisors (4408011).

13224021 is an equidigital number, since it uses as much as digits as its factorization.

13224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 13224021 is about 3636.4847036664. The cubic root of 13224021 is about 236.4764207623.

Adding to 13224021 its reverse (12042231), we get a palindrome (25266252).

The spelling of 13224021 in words is "thirteen million, two hundred twenty-four thousand, twenty-one".