21107358209 has 8 divisors (see below), whose sum is σ = 24200262528. Its totient is φ = 18033845760.

The previous prime is 21107358197. The next prime is 21107358227. The reversal of 21107358209 is 90285370112.

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

It is not a de Polignac number, because 21107358209 - 2⁴ = 21107358193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21107358109) 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, 4845632 + ... + 4849985.

It is an arithmetic number, because the mean of its divisors is an integer number (3025032816).

Almost surely, 2^21107358209 is an apocalyptic number.

It is an amenable number.

21107358209 is a deficient number, since it is larger than the sum of its proper divisors (3092904319).

21107358209 is an equidigital number, since it uses as much as digits as its factorization.

21107358209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695935.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21107358209 in words is "twenty-one billion, one hundred seven million, three hundred fifty-eight thousand, two hundred nine".