11315221 has 4 divisors (see below), whose sum is σ = 11591244. Its totient is φ = 11039200.

The previous prime is 11315207. The next prime is 11315231. The reversal of 11315221 is 12251311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12251311 = 29 ⋅422459.

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 7214596 = 2025^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 11315221 - 2¹¹ = 11313173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11315195 and 11315204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11315201) 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, 137950 + ... + 138031.

It is an arithmetic number, because the mean of its divisors is an integer number (2897811).

Almost surely, 2^11315221 is an apocalyptic number.

It is an amenable number.

11315221 is a deficient number, since it is larger than the sum of its proper divisors (276023).

11315221 is an equidigital number, since it uses as much as digits as its factorization.

11315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276022.

The product of its digits is 60, while the sum is 16.

The square root of 11315221 is about 3363.8104881221. The cubic root of 11315221 is about 224.5024131565.

Adding to 11315221 its reverse (12251311), we get a palindrome (23566532).

The spelling of 11315221 in words is "eleven million, three hundred fifteen thousand, two hundred twenty-one".