21331300209 has 16 divisors (see below), whose sum is σ = 29954184000. Its totient is φ = 13465417536.

The previous prime is 21331300201. The next prime is 21331300213. The reversal of 21331300209 is 90200313312.

It is not a de Polignac number, because 21331300209 - 2³ = 21331300201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21331300201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15087 + ... + 207099.

It is an arithmetic number, because the mean of its divisors is an integer number (1872136500).

Almost surely, 2^21331300209 is an apocalyptic number.

It is an amenable number.

21331300209 is a deficient number, since it is larger than the sum of its proper divisors (8622883791).

21331300209 is a wasteful number, since it uses less digits than its factorization.

21331300209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193984.

The product of its (nonzero) digits is 972, while the sum is 24.

The spelling of 21331300209 in words is "twenty-one billion, three hundred thirty-one million, three hundred thousand, two hundred nine".