21863303809 has 4 divisors (see below), whose sum is σ = 21863694420. Its totient is φ = 21862913200.

The previous prime is 21863303779. The next prime is 21863303863. The reversal of 21863303809 is 90830336812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4498653184 + 17364650625 = 67072^2 + 131775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21863303809 - 2¹³ = 21863295617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21863304809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93742 + ... + 229159.

It is an arithmetic number, because the mean of its divisors is an integer number (5465923605).

Almost surely, 2^21863303809 is an apocalyptic number.

It is an amenable number.

21863303809 is a deficient number, since it is larger than the sum of its proper divisors (390611).

21863303809 is an equidigital number, since it uses as much as digits as its factorization.

21863303809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390610.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 21863303809 in words is "twenty-one billion, eight hundred sixty-three million, three hundred three thousand, eight hundred nine".