22316221 has 2 divisors, whose sum is σ = 22316222. Its totient is φ = 22316220.

The previous prime is 22316213. The next prime is 22316227. The reversal of 22316221 is 12261322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 3705625 = 4314^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 22316221 - 2³ = 22316213 is a prime.

It is a super-3 number, since 3×22316221³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22316227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11158110 + 11158111.

It is an arithmetic number, because the mean of its divisors is an integer number (11158111).

Almost surely, 2^22316221 is an apocalyptic number.

It is an amenable number.

22316221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22316221 is an equidigital number, since it uses as much as digits as its factorization.

22316221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 22316221 is about 4724.0047629104. The cubic root of 22316221 is about 281.5400723471.

Adding to 22316221 its reverse (12261322), we get a palindrome (34577543).

The spelling of 22316221 in words is "twenty-two million, three hundred sixteen thousand, two hundred twenty-one".