22221247 has 2 divisors, whose sum is σ = 22221248. Its totient is φ = 22221246.

The previous prime is 22221233. The next prime is 22221259. The reversal of 22221247 is 74212222.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22221247 - 2¹¹ = 22219199 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110623 + 11110624.

It is an arithmetic number, because the mean of its divisors is an integer number (11110624).

Almost surely, 2^22221247 is an apocalyptic number.

22221247 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221247 is an equidigital number, since it uses as much as digits as its factorization.

22221247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 22.

The square root of 22221247 is about 4713.9417688385. The cubic root of 22221247 is about 281.1401090357.

Adding to 22221247 its reverse (74212222), we get a palindrome (96433469).

The spelling of 22221247 in words is "twenty-two million, two hundred twenty-one thousand, two hundred forty-seven".