10021001609 has 2 divisors, whose sum is σ = 10021001610. Its totient is φ = 10021001608.

The previous prime is 10021001587. The next prime is 10021001623. The reversal of 10021001609 is 90610012001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8107201600 + 1913800009 = 90040^2 + 43747^2 .

It is an emirp because it is prime and its reverse (90610012001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021001609 - 2¹⁶ = 10020936073 is a prime.

It is not a weakly prime, because it can be changed into another prime (10021001009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010500804 + 5010500805.

It is an arithmetic number, because the mean of its divisors is an integer number (5010500805).

Almost surely, 2^10021001609 is an apocalyptic number.

It is an amenable number.

10021001609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021001609 is an equidigital number, since it uses as much as digits as its factorization.

10021001609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 10021001609 in words is "ten billion, twenty-one million, one thousand, six hundred nine".