1022021009 has 2 divisors, whose sum is σ = 1022021010. Its totient is φ = 1022021008.

The previous prime is 1022020999. The next prime is 1022021017. The reversal of 1022021009 is 9001202201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848440384 + 173580625 = 29128^2 + 13175^2 .

It is an emirp because it is prime and its reverse (9001202201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022021009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1022021089) 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, 511010504 + 511010505.

It is an arithmetic number, because the mean of its divisors is an integer number (511010505).

Almost surely, 2^1022021009 is an apocalyptic number.

It is an amenable number.

1022021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022021009 is an equidigital number, since it uses as much as digits as its factorization.

1022021009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1022021009 is about 31969.0633112702. The cubic root of 1022021009 is about 1007.2871054412.

The spelling of 1022021009 in words is "one billion, twenty-two million, twenty-one thousand, nine".