11221213 has 8 divisors (see below), whose sum is σ = 11502648. Its totient is φ = 10942464.

The previous prime is 11221211. The next prime is 11221219. The reversal of 11221213 is 31212211.

It can be written as a sum of positive squares in 4 ways, for example, as 743044 + 10478169 = 862^2 + 3237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11221213 - 2¹ = 11221211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221193 and 11221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9681 + ... + 10777.

It is an arithmetic number, because the mean of its divisors is an integer number (1437831).

Almost surely, 2^11221213 is an apocalyptic number.

It is an amenable number.

11221213 is a deficient number, since it is larger than the sum of its proper divisors (281435).

11221213 is a wasteful number, since it uses less digits than its factorization.

11221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343.

The product of its digits is 24, while the sum is 13.

The square root of 11221213 is about 3349.8079049402. The cubic root of 11221213 is about 223.8789537860.

Adding to 11221213 its reverse (31212211), we get a palindrome (42433424).

It can be divided in two parts, 112212 and 13, that added together give a square (112225 = 335²).

The spelling of 11221213 in words is "eleven million, two hundred twenty-one thousand, two hundred thirteen".