11221506 has 12 divisors (see below), whose sum is σ = 24313302. Its totient is φ = 3740496.

The previous prime is 11221501. The next prime is 11221523. The reversal of 11221506 is 60512211.

It can be written as a sum of positive squares in only one way, i.e., 7241481 + 3980025 = 2691^2 + 1995^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 623417 = 11221506 / (1 + 1 + 2 + 2 + 1 + 5 + 0 + 6).

It is not an unprimeable number, because it can be changed into a prime (11221501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 311691 + ... + 311726.

Almost surely, 2^11221506 is an apocalyptic number.

11221506 is an abundant number, since it is smaller than the sum of its proper divisors (13091796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11221506 is a wasteful number, since it uses less digits than its factorization.

11221506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623425 (or 623422 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 11221506 is about 3349.8516385058. The cubic root of 11221506 is about 223.8809023562.

Adding to 11221506 its reverse (60512211), we get a palindrome (71733717).

It can be divided in two parts, 1122 and 1506, that added together give a triangular number (2628 = T₇₂).

The spelling of 11221506 in words is "eleven million, two hundred twenty-one thousand, five hundred six".