13215226 has 4 divisors (see below), whose sum is σ = 19822842. Its totient is φ = 6607612.

The previous prime is 13215221. The next prime is 13215229. The reversal of 13215226 is 62251231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62251231 = 7 ⋅8893033.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 4004001 = 3035^2 + 2001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13215197 and 13215206.

It is not an unprimeable number, because it can be changed into a prime (13215221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303805 + ... + 3303808.

Almost surely, 2^13215226 is an apocalyptic number.

13215226 is a deficient number, since it is larger than the sum of its proper divisors (6607616).

13215226 is an equidigital number, since it uses as much as digits as its factorization.

13215226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6607615.

The product of its digits is 720, while the sum is 22.

The square root of 13215226 is about 3635.2752302955. The cubic root of 13215226 is about 236.4239840798.

Adding to 13215226 its reverse (62251231), we get a palindrome (75466457).

The spelling of 13215226 in words is "thirteen million, two hundred fifteen thousand, two hundred twenty-six".