1021210609 has 2 divisors, whose sum is σ = 1021210610. Its totient is φ = 1021210608.

The previous prime is 1021210601. The next prime is 1021210681. The reversal of 1021210609 is 9060121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944209984 + 77000625 = 30728^2 + 8775^2 .

It is an emirp because it is prime and its reverse (9060121201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021210609 - 2³ = 1021210601 is a prime.

It is a super-2 number, since 2×1021210609² = 2085742215868301762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021210609.

It is not a weakly prime, because it can be changed into another prime (1021210601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510605304 + 510605305.

It is an arithmetic number, because the mean of its divisors is an integer number (510605305).

Almost surely, 2^1021210609 is an apocalyptic number.

It is an amenable number.

1021210609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021210609 is an equidigital number, since it uses as much as digits as its factorization.

1021210609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1021210609 is about 31956.3860441071. The cubic root of 1021210609 is about 1007.0207960672.

The spelling of 1021210609 in words is "one billion, twenty-one million, two hundred ten thousand, six hundred nine".