21010010009 has 8 divisors (see below), whose sum is σ = 21171870720. Its totient is φ = 20848707376.

The previous prime is 21010009991. The next prime is 21010010011. The reversal of 21010010009 is 90001001012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010010009 - 2²⁰ = 21008961433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010009975 and 21010010002.

It is not an unprimeable number, because it can be changed into a prime (21010010059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63779 + ... + 214680.

It is an arithmetic number, because the mean of its divisors is an integer number (2646483840).

Almost surely, 2^21010010009 is an apocalyptic number.

It is an amenable number.

21010010009 is a deficient number, since it is larger than the sum of its proper divisors (161860711).

21010010009 is a wasteful number, since it uses less digits than its factorization.

21010010009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279039.

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 21010010009 in words is "twenty-one billion, ten million, ten thousand, nine".