21313371909 has 8 divisors (see below), whose sum is σ = 28441261792. Its totient is φ = 14197198320.

The previous prime is 21313371883. The next prime is 21313371917. The reversal of 21313371909 is 90917331312.

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

It is not a de Polignac number, because 21313371909 - 2²⁷ = 21179154181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313371979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2924827 + ... + 2932104.

It is an arithmetic number, because the mean of its divisors is an integer number (3555157724).

Almost surely, 2^21313371909 is an apocalyptic number.

It is an amenable number.

21313371909 is a deficient number, since it is larger than the sum of its proper divisors (7127889883).

21313371909 is a wasteful number, since it uses less digits than its factorization.

21313371909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858147.

The product of its (nonzero) digits is 30618, while the sum is 39.

The spelling of 21313371909 in words is "twenty-one billion, three hundred thirteen million, three hundred seventy-one thousand, nine hundred nine".