21384564911 has 8 divisors (see below), whose sum is σ = 22696270704. Its totient is φ = 20078835840.

The previous prime is 21384564907. The next prime is 21384564917. The reversal of 21384564911 is 11946548312.

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 21384564911 - 2² = 21384564907 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 (21384564917) 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, 1486805 + ... + 1501118.

It is an arithmetic number, because the mean of its divisors is an integer number (2837033838).

Almost surely, 2^21384564911 is an apocalyptic number.

21384564911 is a deficient number, since it is larger than the sum of its proper divisors (1311705793).

21384564911 is a wasteful number, since it uses less digits than its factorization.

21384564911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2988361.

The product of its digits is 207360, while the sum is 44.

The spelling of 21384564911 in words is "twenty-one billion, three hundred eighty-four million, five hundred sixty-four thousand, nine hundred eleven".