84224221 has 2 divisors, whose sum is σ = 84224222. Its totient is φ = 84224220.

The previous prime is 84224123. The next prime is 84224249. The reversal of 84224221 is 12242248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45024100 + 39200121 = 6710^2 + 6261^2 .

It is a cyclic number.

It is not a de Polignac number, because 84224221 - 2⁹ = 84223709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84224281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42112110 + 42112111.

It is an arithmetic number, because the mean of its divisors is an integer number (42112111).

Almost surely, 2^84224221 is an apocalyptic number.

It is an amenable number.

84224221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84224221 is an equidigital number, since it uses as much as digits as its factorization.

84224221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 25.

The square root of 84224221 is about 9177.3754962952. The cubic root of 84224221 is about 438.3412424499.

Adding to 84224221 its reverse (12242248), we get a palindrome (96466469).

The spelling of 84224221 in words is "eighty-four million, two hundred twenty-four thousand, two hundred twenty-one".