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222312221 is a prime number
BaseRepresentation
bin11010100000000…
…11011100011101
3120111022122000222
431100003130131
5423402442341
634020531125
75336423405
oct1520033435
9514278028
10222312221
1110454250a
1262550aa5
1337099cc1
142174d805
15147b544b
hexd40371d

222312221 has 2 divisors, whose sum is σ = 222312222. Its totient is φ = 222312220.

The previous prime is 222312199. The next prime is 222312257. The reversal of 222312221 is 122213222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127464100 + 94848121 = 11290^2 + 9739^2 .

It is a cyclic number.

It is not a de Polignac number, because 222312221 - 214 = 222295837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222312221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222312271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111156110 + 111156111.

It is an arithmetic number, because the mean of its divisors is an integer number (111156111).

Almost surely, 2222312221 is an apocalyptic number.

It is an amenable number.

222312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222312221 is an equidigital number, since it uses as much as digits as its factorization.

222312221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 222312221 is about 14910.1381952013. The cubic root of 222312221 is about 605.7886225574.

Adding to 222312221 its reverse (122213222), we get a palindrome (344525443).

The spelling of 222312221 in words is "two hundred twenty-two million, three hundred twelve thousand, two hundred twenty-one".