1002021002809 has 2 divisors, whose sum is σ = 1002021002810. Its totient is φ = 1002021002808.

The previous prime is 1002021002803. The next prime is 1002021002869. The reversal of 1002021002809 is 9082001202001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669691812409 + 332329190400 = 818347^2 + 576480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021002809 - 2¹⁹ = 1002020478521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1002021002803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501010501404 + 501010501405.

It is an arithmetic number, because the mean of its divisors is an integer number (501010501405).

Almost surely, 2^{1002021002809} is an apocalyptic number.

It is an amenable number.

1002021002809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002021002809 is an equidigital number, since it uses as much as digits as its factorization.

1002021002809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

It can be divided in two parts, 100202 and 1002809, that added together give a palindrome (1103011).

The spelling of 1002021002809 in words is "one trillion, two billion, twenty-one million, two thousand, eight hundred nine".