10021012009 has 4 divisors (see below), whose sum is σ = 10021231440. Its totient is φ = 10020792580.

The previous prime is 10021011997. The next prime is 10021012021. The reversal of 10021012009 is 90021012001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90021012001 = 43 ⋅2093511907.

It is an interprime number because it is at equal distance from previous prime (10021011997) and next prime (10021012021).

It is a cyclic number.

It is not a de Polignac number, because 10021012009 - 2¹¹ = 10021009961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021011983 and 10021012001.

It is not an unprimeable number, because it can be changed into a prime (10021012109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12499 + ... + 142120.

It is an arithmetic number, because the mean of its divisors is an integer number (2505307860).

Almost surely, 2^10021012009 is an apocalyptic number.

It is an amenable number.

10021012009 is a deficient number, since it is larger than the sum of its proper divisors (219431).

10021012009 is an equidigital number, since it uses as much as digits as its factorization.

10021012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219430.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 10021012009 in words is "ten billion, twenty-one million, twelve thousand, nine".