2078221 has 2 divisors, whose sum is σ = 2078222. Its totient is φ = 2078220.

The previous prime is 2078207. The next prime is 2078243. The reversal of 2078221 is 1228702.

It is an a-pointer prime, because the next prime (2078243) can be obtained adding 2078221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 837225 = 1114^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2078221 - 2⁷ = 2078093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2078192 and 2078201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2078621) 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, 1039110 + 1039111.

It is an arithmetic number, because the mean of its divisors is an integer number (1039111).

2^2078221 is an apocalyptic number.

It is an amenable number.

2078221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078221 is an equidigital number, since it uses as much as digits as its factorization.

2078221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2078221 is about 1441.6036209721. The cubic root of 2078221 is about 127.6136830483.

The spelling of 2078221 in words is "two million, seventy-eight thousand, two hundred twenty-one".