11221247 has 2 divisors, whose sum is σ = 11221248. Its totient is φ = 11221246.

The previous prime is 11221219. The next prime is 11221253. The reversal of 11221247 is 74212211.

It is a strong prime.

It is an emirp because it is prime and its reverse (74212211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11221247 - 2⁸ = 11220991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610623 + 5610624.

It is an arithmetic number, because the mean of its divisors is an integer number (5610624).

Almost surely, 2^11221247 is an apocalyptic number.

11221247 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221247 is an equidigital number, since it uses as much as digits as its factorization.

11221247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 20.

The square root of 11221247 is about 3349.8129798542. The cubic root of 11221247 is about 223.8791799017.

Adding to 11221247 its reverse (74212211), we get a palindrome (85433458).

The spelling of 11221247 in words is "eleven million, two hundred twenty-one thousand, two hundred forty-seven".