21344566511 has 8 divisors (see below), whose sum is σ = 21801415680. Its totient is φ = 20887830328.

The previous prime is 21344566489. The next prime is 21344566517. The reversal of 21344566511 is 11566544312.

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

It is a cyclic number.

It is not a de Polignac number, because 21344566511 - 2¹⁴ = 21344550127 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 (21344566517) 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, 433430 + ... + 480156.

It is an arithmetic number, because the mean of its divisors is an integer number (2725176960).

Almost surely, 2^21344566511 is an apocalyptic number.

21344566511 is a deficient number, since it is larger than the sum of its proper divisors (456849169).

21344566511 is an equidigital number, since it uses as much as digits as its factorization.

21344566511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56493.

The product of its digits is 86400, while the sum is 38.

The spelling of 21344566511 in words is "twenty-one billion, three hundred forty-four million, five hundred sixty-six thousand, five hundred eleven".