21300302009 has 24 divisors (see below), whose sum is σ = 25104401928. Its totient is φ = 18018389760.

The previous prime is 21300301993. The next prime is 21300302021. The reversal of 21300302009 is 90020300312.

It can be written as a sum of positive squares in 4 ways, for example, as 3972528784 + 17327773225 = 63028^2 + 131635^2 .

It is not a de Polignac number, because 21300302009 - 2⁴ = 21300301993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21300302029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1152179 + ... + 1170519.

It is an arithmetic number, because the mean of its divisors is an integer number (1046016747).

Almost surely, 2^21300302009 is an apocalyptic number.

It is an amenable number.

21300302009 is a deficient number, since it is larger than the sum of its proper divisors (3804099919).

21300302009 is a wasteful number, since it uses less digits than its factorization.

21300302009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18665 (or 18658 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The spelling of 21300302009 in words is "twenty-one billion, three hundred million, three hundred two thousand, nine".