13220733 has 4 divisors (see below), whose sum is σ = 17627648. Its totient is φ = 8813820.

The previous prime is 13220731. The next prime is 13220741. The reversal of 13220733 is 33702231.

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: 33702231 = 3 ⋅11234077.

It is not a de Polignac number, because 13220733 - 2¹ = 13220731 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220731) 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, 2203453 + ... + 2203458.

It is an arithmetic number, because the mean of its divisors is an integer number (4406912).

Almost surely, 2^13220733 is an apocalyptic number.

It is an amenable number.

13220733 is a deficient number, since it is larger than the sum of its proper divisors (4406915).

13220733 is an equidigital number, since it uses as much as digits as its factorization.

13220733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406914.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 13220733 is about 3636.0325906130. The cubic root of 13220733 is about 236.4568200946.

Adding to 13220733 its reverse (33702231), we get a palindrome (46922964).

The spelling of 13220733 in words is "thirteen million, two hundred twenty thousand, seven hundred thirty-three".