21183648393 has 32 divisors (see below), whose sum is σ = 29808414720. Its totient is φ = 13355038400.

The previous prime is 21183648389. The next prime is 21183648449. The reversal of 21183648393 is 39384638112.

It is a cyclic number.

It is not a de Polignac number, because 21183648393 - 2² = 21183648389 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21183640393) 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 31 ways as a sum of consecutive naturals, for example, 5845180 + ... + 5848802.

It is an arithmetic number, because the mean of its divisors is an integer number (931512960).

Almost surely, 2^21183648393 is an apocalyptic number.

21183648393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21183648393 is a deficient number, since it is larger than the sum of its proper divisors (8624766327).

21183648393 is a wasteful number, since it uses less digits than its factorization.

21183648393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589.

The product of its digits is 746496, while the sum is 48.

The spelling of 21183648393 in words is "twenty-one billion, one hundred eighty-three million, six hundred forty-eight thousand, three hundred ninety-three".