21011010009 has 8 divisors (see below), whose sum is σ = 30561469152. Its totient is φ = 12733945440.

The previous prime is 21011009993. The next prime is 21011010011. The reversal of 21011010009 is 90001011012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21011010009 - 2⁴ = 21011009993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011010009.

It is not an unprimeable number, because it can be changed into a prime (21011010029) 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 in 7 ways as a sum of consecutive naturals, for example, 318348604 + ... + 318348669.

It is an arithmetic number, because the mean of its divisors is an integer number (3820183644).

Almost surely, 2^21011010009 is an apocalyptic number.

It is an amenable number.

21011010009 is a deficient number, since it is larger than the sum of its proper divisors (9550459143).

21011010009 is a wasteful number, since it uses less digits than its factorization.

21011010009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636697287.

The product of its (nonzero) digits is 18, while the sum is 15.

The spelling of 21011010009 in words is "twenty-one billion, eleven million, ten thousand, nine".