13218235 has 4 divisors (see below), whose sum is σ = 15861888. Its totient is φ = 10574584.

The previous prime is 13218209. The next prime is 13218263. The reversal of 13218235 is 53281231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53281231 = 1873 ⋅28447.

It is a cyclic number.

It is not a de Polignac number, because 13218235 - 2²¹ = 11121083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321819 + ... + 1321828.

It is an arithmetic number, because the mean of its divisors is an integer number (3965472).

Almost surely, 2^13218235 is an apocalyptic number.

13218235 is a deficient number, since it is larger than the sum of its proper divisors (2643653).

13218235 is an equidigital number, since it uses as much as digits as its factorization.

13218235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643652.

The product of its digits is 1440, while the sum is 25.

The square root of 13218235 is about 3635.6890681135. The cubic root of 13218235 is about 236.4419266607.

Adding to 13218235 its reverse (53281231), we get a palindrome (66499466).

The spelling of 13218235 in words is "thirteen million, two hundred eighteen thousand, two hundred thirty-five".