1028941021 has 2 divisors, whose sum is σ = 1028941022. Its totient is φ = 1028941020.

The previous prime is 1028941013. The next prime is 1028941063. The reversal of 1028941021 is 1201498201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576528121 + 452412900 = 24011^2 + 21270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028941021 - 2³ = 1028941013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028941091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514470510 + 514470511.

It is an arithmetic number, because the mean of its divisors is an integer number (514470511).

Almost surely, 2^1028941021 is an apocalyptic number.

It is an amenable number.

1028941021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028941021 is an equidigital number, since it uses as much as digits as its factorization.

1028941021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1028941021 is about 32077.1105463070. The cubic root of 1028941021 is about 1009.5554103121. Note that the first 3 decimals are identical.

The spelling of 1028941021 in words is "one billion, twenty-eight million, nine hundred forty-one thousand, twenty-one".