1228021 has 2 divisors, whose sum is σ = 1228022. Its totient is φ = 1228020.

The previous prime is 1228013. The next prime is 1228091. The reversal of 1228021 is 1208221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 505521 = 850^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228021 - 2³ = 1228013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1227986 and 1228004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228001) 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, 614010 + 614011.

It is an arithmetic number, because the mean of its divisors is an integer number (614011).

2^1228021 is an apocalyptic number.

It is an amenable number.

1228021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228021 is an equidigital number, since it uses as much as digits as its factorization.

1228021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1228021 is about 1108.1610893728. The cubic root of 1228021 is about 107.0866331891.

The spelling of 1228021 in words is "one million, two hundred twenty-eight thousand, twenty-one".