21320111309 has 8 divisors (see below), whose sum is σ = 24368574528. Its totient is φ = 18272331360.

The previous prime is 21320111291. The next prime is 21320111363. The reversal of 21320111309 is 90311102312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320111309 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 (21320111509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102107 + ... + 230360.

It is an arithmetic number, because the mean of its divisors is an integer number (3046071816).

Almost surely, 2^21320111309 is an apocalyptic number.

It is an amenable number.

21320111309 is a deficient number, since it is larger than the sum of its proper divisors (3048463219).

21320111309 is an equidigital number, since it uses as much as digits as its factorization.

21320111309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341635.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21320111309 in words is "twenty-one billion, three hundred twenty million, one hundred eleven thousand, three hundred nine".